1
|
Alemayehu DB, Todoh M, Huang SJ. Advancing 3D Dental Implant Finite Element Analysis: Incorporating Biomimetic Trabecular Bone with Varied Pore Sizes in Voronoi Lattices. J Funct Biomater 2024; 15:94. [PMID: 38667551 PMCID: PMC11051206 DOI: 10.3390/jfb15040094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 03/31/2024] [Accepted: 04/01/2024] [Indexed: 04/28/2024] Open
Abstract
The human mandible's cancellous bone, which is characterized by its unique porosity and directional sensitivity to external forces, is crucial for sustaining biting stress. Traditional computer- aided design (CAD) models fail to fully represent the bone's anisotropic structure and thus depend on simple isotropic assumptions. For our research, we use the latest versions of nTOP 4.17.3 and Creo Parametric 8.0 software to make biomimetic Voronoi lattice models that accurately reflect the complex geometry and mechanical properties of trabecular bone. The porosity of human cancellous bone is accurately modeled in this work using biomimetic Voronoi lattice models. The porosities range from 70% to 95%, which can be achieved by changing the pore sizes to 1.0 mm, 1.5 mm, 2.0 mm, and 2.5 mm. Finite element analysis (FEA) was used to examine the displacements, stresses, and strains acting on dental implants with a buttress thread, abutment, retaining screw, and biting load surface. The results show that the Voronoi model accurately depicts the complex anatomy of the trabecular bone in the human jaw, compared to standard solid block models. The ideal pore size for biomimetic Voronoi lattice trabecular bone models is 2 mm, taking in to account both the von Mises stress distribution over the dental implant, screw retention, cortical bone, cancellous bone, and micromotions. This pore size displayed balanced performance by successfully matching natural bone's mechanical characteristics. Advanced FEA improves the biomechanical understanding of how bones and implants interact by creating more accurate models of biological problems and dynamic loading situations. This makes biomechanical engineering better.
Collapse
Affiliation(s)
- Dawit Bogale Alemayehu
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan;
| | - Masahiro Todoh
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;
| | - Song-Jeng Huang
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| |
Collapse
|
2
|
Gu Y, Oku H, Todoh M. American Sign Language Recognition and Translation Using Perception Neuron Wearable Inertial Motion Capture System. Sensors (Basel) 2024; 24:453. [PMID: 38257544 PMCID: PMC10819960 DOI: 10.3390/s24020453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/17/2023] [Accepted: 01/10/2024] [Indexed: 01/24/2024]
Abstract
Sign language is designed as a natural communication method to convey messages among the deaf community. In the study of sign language recognition through wearable sensors, the data sources are limited, and the data acquisition process is complex. This research aims to collect an American sign language dataset with a wearable inertial motion capture system and realize the recognition and end-to-end translation of sign language sentences with deep learning models. In this work, a dataset consisting of 300 commonly used sentences is gathered from 3 volunteers. In the design of the recognition network, the model mainly consists of three layers: convolutional neural network, bi-directional long short-term memory, and connectionist temporal classification. The model achieves accuracy rates of 99.07% in word-level evaluation and 97.34% in sentence-level evaluation. In the design of the translation network, the encoder-decoder structured model is mainly based on long short-term memory with global attention. The word error rate of end-to-end translation is 16.63%. The proposed method has the potential to recognize more sign language sentences with reliable inertial data from the device.
Collapse
Affiliation(s)
- Yutong Gu
- Faculty of Informatics, Gunma University, Kiryu 3768515, Japan;
- Graduate School of Engineering, Hokkaido University, Sapporo 0608628, Japan
| | - Hiromasa Oku
- Faculty of Informatics, Gunma University, Kiryu 3768515, Japan;
| | - Masahiro Todoh
- Faculty of Engineering, Hokkaido University, Sapporo 0608628, Japan;
| |
Collapse
|
3
|
Alemayehu DB, Todoh M, Hsieh JH, Li C, Huang SJ. Improving Pure Titanium's Biological and Mechanical Characteristics through ECAP and Micro-Arc Oxidation Processes. Micromachines (Basel) 2023; 14:1541. [PMID: 37630077 PMCID: PMC10456902 DOI: 10.3390/mi14081541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/07/2023] [Accepted: 07/24/2023] [Indexed: 08/27/2023]
Abstract
Pure titanium is limited to be used in biomedical applications due to its lower mechanical strength compared to its alloy counterpart. To enhance its properties and improve medical implants feasibility, advancements in titanium processing technologies are necessary. One such technique is equal-channel angular pressing (ECAP) for its severe plastic deformation (SPD). This study aims to surface modify commercially pure titanium using micro-arc oxidation (MAO) or plasma electrolytic oxidation (PEO) technologies, and mineral solutions containing Ca and P. The composition, metallography, and shape of the changed surface were characterized using X-ray diffraction (XRD), digital optical microscopy (OM), and scanning electron microscope (SEM), respectively. A microhardness test is conducted to assess each sample's mechanical strength. The weight % of Ca and P in the coating was determined using energy dispersive spectroscopy (EDS), and the corrosion resistance was evaluated through potentiodynamic measurement. The behavior of human dental pulp cell and periodontal cell behavior was also studied through a biomedical experiment over a period of 1-, 3-, and 7-days using culture medium, and the cell death and viability can be inferred with the help of enzyme-linked immunosorbent assay (ELISA) since it can detect proteins or biomarkers secreted by cells undergoing apoptosis or necrosis. This study shows that the mechanical grain refinement method and surface modification might improve the mechanical and biomechanical properties of commercially pure (CP) titanium. According to the results of the corrosion loss measurements, 2PassMAO had the lowest corrosion rate, which is determined to be 0.495 mmpy. The electrode potentials for the 1-pass and 2-pass coated samples are 1.44 V and 1.47 V, respectively. This suggests that the coating is highly effective in reducing the corrosion rate of the metallic CP Ti sample. Changes in the grain size and the presence of a high number of grain boundaries have a significant impact on the corrosion resistance of CP Ti. For ECAPED and surface-modified titanium samples in a 3.6% NaCl electrolyte solution, electrochemical impedance spectroscopy (EIS) properties are similar to Nyquist and Bode plot fitting. In light of ISO 10993-5 guidelines for assessing in vitro cytotoxicity, this study contributes valuable insights into pulp and periodontal cell behavior, focusing specifically on material cytotoxicity, a critical factor determined by a 30% decrease in cell viability.
Collapse
Affiliation(s)
- Dawit Bogale Alemayehu
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan;
| | - Masahiro Todoh
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;
| | - Jang-Hsing Hsieh
- Department of Materials Engineering, Ming Chi University of Technology, Taipei 24301, Taiwan
| | - Chuan Li
- Department of Biomedical Engineering, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
- Department of Mechanical Engineering, National Central University, Taoyuan 32001, Taiwan
| | - Song-Jeng Huang
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| |
Collapse
|
4
|
Zhao Y, Zhang M, Wu H, He X, Todoh M. Neuromechanics-Based Neural Feedback Controller for Planar Arm Reaching Movements. Bioengineering (Basel) 2023; 10:bioengineering10040436. [PMID: 37106623 PMCID: PMC10136284 DOI: 10.3390/bioengineering10040436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/22/2023] [Accepted: 03/24/2023] [Indexed: 04/29/2023] Open
Abstract
Based on the principles of neuromechanics, human arm movements result from the dynamic interaction between the nervous, muscular, and skeletal systems. To develop an effective neural feedback controller for neuro-rehabilitation training, it is important to consider both the effects of muscles and skeletons. In this study, we designed a neuromechanics-based neural feedback controller for arm reaching movements. To achieve this, we first constructed a musculoskeletal arm model based on the actual biomechanical structure of the human arm. Subsequently, a hybrid neural feedback controller was developed that mimics the multifunctional areas of the human arm. The performance of this controller was then validated through numerical simulation experiments. The simulation results demonstrated a bell-shaped movement trajectory, consistent with the natural motion of human arm movements. Furthermore, the experiment testing the tracking ability of the controller revealed real-time errors within one millimeter, with the tensile force generated by the controller's muscles being stable and maintained at a low value, thereby avoiding the issue of muscle strain that can occur due to excessive excitation during the neurorehabilitation process.
Collapse
Affiliation(s)
- Yongkun Zhao
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
| | - Mingquan Zhang
- State Key Laboratory of Bioelectronics, Jiangsu Provincial Key Laboratory of Remote Measurement and Control, School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
| | - Haijun Wu
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Xiangkun He
- Department of Bioengineering, Faculty of Engineering, Imperial College London, London SW7 2AZ, UK
| | - Masahiro Todoh
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| |
Collapse
|
5
|
Zhao Y, Wu H, Zhang M, Mao J, Todoh M. Design methodology of portable upper limb exoskeletons for people with strokes. Front Neurosci 2023; 17:1128332. [PMID: 37008203 PMCID: PMC10060802 DOI: 10.3389/fnins.2023.1128332] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 02/27/2023] [Indexed: 03/18/2023] Open
Affiliation(s)
- Yongkun Zhao
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, Sapporo, Japan
- Department of Bioengineering, Faculty of Engineering, Imperial College London, London, United Kingdom
| | - Haijun Wu
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Mingquan Zhang
- State Key Laboratory of Bioelectronics, Jiangsu Provincial Key Laboratory of Remote Measurement and Control, School of Instrument Science and Engineering, Southeast University, Nanjing, China
| | - Juzheng Mao
- State Key Laboratory of Bioelectronics, Jiangsu Provincial Key Laboratory of Remote Measurement and Control, School of Instrument Science and Engineering, Southeast University, Nanjing, China
- *Correspondence: Juzheng Mao
| | - Masahiro Todoh
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| |
Collapse
|
6
|
Zhao Y, Ding S, Todoh M. Validate the force-velocity relation of the Hill's muscle model from a molecular perspective. Front Bioeng Biotechnol 2022; 10:1006571. [PMID: 36312549 PMCID: PMC9614041 DOI: 10.3389/fbioe.2022.1006571] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/30/2022] [Indexed: 07/30/2023] Open
Affiliation(s)
- Yongkun Zhao
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, Sapporo, Japan
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka, Japan
| | - Shihang Ding
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka, Japan
| | - Masahiro Todoh
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| |
Collapse
|
7
|
Gu Y, Zheng C, Todoh M, Zha F. American Sign Language Translation Using Wearable Inertial and Electromyography Sensors for Tracking Hand Movements and Facial Expressions. Front Neurosci 2022; 16:962141. [PMID: 35937881 PMCID: PMC9345758 DOI: 10.3389/fnins.2022.962141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 06/17/2022] [Indexed: 11/29/2022] Open
Abstract
A sign language translation system can break the communication barrier between hearing-impaired people and others. In this paper, a novel American sign language (ASL) translation method based on wearable sensors was proposed. We leveraged inertial sensors to capture signs and surface electromyography (EMG) sensors to detect facial expressions. We applied a convolutional neural network (CNN) to extract features from input signals. Then, long short-term memory (LSTM) and transformer models were exploited to achieve end-to-end translation from input signals to text sentences. We evaluated two models on 40 ASL sentences strictly following the rules of grammar. Word error rate (WER) and sentence error rate (SER) are utilized as the evaluation standard. The LSTM model can translate sentences in the testing dataset with a 7.74% WER and 9.17% SER. The transformer model performs much better by achieving a 4.22% WER and 4.72% SER. The encouraging results indicate that both models are suitable for sign language translation with high accuracy. With complete motion capture sensors and facial expression recognition methods, the sign language translation system has the potential to recognize more sentences.
Collapse
Affiliation(s)
- Yutong Gu
- Graduate School of Engineering, Hokkaido University, Sapporo, Japan
- *Correspondence: Yutong Gu
| | - Chao Zheng
- Wuhan Second Ship Design and Research Institute, China State Shipbuilding Corporation Limited, Wuhan, China
| | - Masahiro Todoh
- Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Fusheng Zha
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, China
| |
Collapse
|
8
|
Takahata M, Shimizu T, Yamada S, Yamamoto T, Hasegawa T, Fujita R, Kobayashi H, Endo T, Koike Y, Amizuka N, Todoh M, Okumura JI, Kajino T, Iwasaki N. Bone biopsy findings in patients receiving long-term bisphosphonate therapy for glucocorticoid-induced osteoporosis. J Bone Miner Metab 2022; 40:613-622. [PMID: 35333984 DOI: 10.1007/s00774-022-01323-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 03/01/2022] [Indexed: 01/11/2023]
Abstract
INTRODUCTION Bisphosphonates (BPs) have been shown to reduce the incidence of vertebral fractures during the first year or two of glucocorticoid (GC) treatments and are therefore recommended as a first-line treatment for GC-induced osteoporosis (GIO). However, there are theoretical concerns about the long-term use of BPs in low-turnover osteoporosis caused by chronic GC therapy. MATERIALS AND METHODS We analyzed the trabecular microarchitecture, bone metabolism, and material strength of iliac crest bone biopsy samples from 10 female patients with rheumatoid arthritis who received an average of 6.7 years of BP therapy for GIO (GIOBP group), compared with those of 10 age- and bone mineral density (BMD)-matched non-rheumatoid arthritis postmenopausal women (reference group). RESULTS Patients in the GIOBP group had a significantly greater fracture severity index, as calculated from the number and the extent of vertebral fractures compared with the reference patients. Micro-computed tomography analysis showed that the degree of mineralization and trabecular microarchitecture were significantly lower in the GIOBP group than in the reference patients. Patients in the GIOBP group exhibited lower bone contact stiffness, determined by micro-indentation testing, than in the reference group. The contact stiffness of the bone was negatively correlated with the fracture severity index and the daily prednisolone dosage. Immunohistochemistry and serum bone turnover markers showed decreased osteoclastic activity, impaired mineralization, and an increased fraction of empty lacunae in the GIOBP group. CONCLUSION Our findings indicate that patients receiving long-term BP for GIO are still at high risk for fragility fractures because of poor bone quality.
Collapse
Affiliation(s)
- Masahiko Takahata
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan.
| | - Tomohiro Shimizu
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Satoshi Yamada
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Tomomaya Yamamoto
- Division of Oral Health Science, Department of Developmental Biology of Hard Tissue, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Tomoka Hasegawa
- Division of Oral Health Science, Department of Developmental Biology of Hard Tissue, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
| | - Ryo Fujita
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Hideyuki Kobayashi
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Tsutomu Endo
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Yoshinao Koike
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Norio Amizuka
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Masahiro Todoh
- Division of Mechanical and Aerospace Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Jun-Ichiro Okumura
- Department of Orthopedic Surgery, Sapporo City General Hospital, Sapporo, Hokkaido, Japan
| | - Tomomichi Kajino
- Department of Orthopedic Surgery, Tonan Hospital, Sapporo, Hokkaido, Japan
| | - Norimasa Iwasaki
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| |
Collapse
|
9
|
Yamada S, Fukasawa K, Suzuki Y, Takahashi Y, Todoh M, Tadano S. The role of geometrical features of the microarchitecture in the cancellous stiffness of the bovine femoral bone. Med Eng Phys 2022; 105:103823. [DOI: 10.1016/j.medengphy.2022.103823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 04/28/2022] [Accepted: 05/22/2022] [Indexed: 11/16/2022]
|
10
|
Zhu B, Yokozeki K, Kabir MA, Todoh M, Akazawa T, Murata M. Chemical Properties of Human Dentin Blocks and Vertical Augmentation by Ultrasonically Demineralized Dentin Matrix Blocks on Scratched Skull without Periosteum of Adult-Aged Rats. Materials (Basel) 2021; 15:ma15010105. [PMID: 35009252 PMCID: PMC8746034 DOI: 10.3390/ma15010105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/17/2021] [Accepted: 12/20/2021] [Indexed: 11/26/2022]
Abstract
Vertical augmentation is one of the most challenging techniques in bone engineering. Several parameters, such mechano-chemical characteristics, are important to optimize vertical bone regeneration using biomaterials. The aims of this study were to chemically characterize human dentin blocks (calcified demineralized dentin matrix: CDM, partially demineralized dentin matrix: PDDM and completely demineralized dentin matrix: CDDM) (2 × 2 × 1 mm3) chemically and evaluate the behavior of PDDM blocks on non-scratched or scratched skulls without periosteum of adult rats (10–12 months old, female) as a vertical augmentation model. The dissolved efficiency of CDM showed 32.3% after ultrasonic demineralization in 1.0 L of 2% HNO3 for 30 min. The 30 min-demineralized dentin was named PDDM. The SEM images of PDDM showed the opening of dentinal tubes, nano-microcracks and the smooth surface. In the collagenase digestion test, the weight-decreasing rates of CDM, PDDM and CDDM were 9.2%, 25.5% and 78.3% at 12 weeks, respectively. CDM inhibited the collagenase digestion, compared with PDDM and CDDM. In the PDDM onlay graft on an ultrasonically scratched skull, the bone marrow-space opening from original bone was found in the bony bridge formation between the human PDDM block and dense skull of adult senior rats at 4 and 8 weeks. On the other hand, in the cases of the marrow-space closing in both non-scratched skulls and scratched skulls, the bony bridge was not formed. The results indicated that the ultrasonic scratching into the compact parietal bone might contribute greatly to the marrow-space opening from skull and the supply of marrow cells, and then bony bridge formation could occur in the vertical augmentation model without a periosteum.
Collapse
Affiliation(s)
- Bowen Zhu
- Division of Oral Regenerative Medicine, School of Dentistry, Health Science University of Hokkaido, Kanazawa 061-0293, Japan; (B.Z.); (K.Y.); (M.A.K.)
| | - Kenji Yokozeki
- Division of Oral Regenerative Medicine, School of Dentistry, Health Science University of Hokkaido, Kanazawa 061-0293, Japan; (B.Z.); (K.Y.); (M.A.K.)
| | - Md. Arafat Kabir
- Division of Oral Regenerative Medicine, School of Dentistry, Health Science University of Hokkaido, Kanazawa 061-0293, Japan; (B.Z.); (K.Y.); (M.A.K.)
| | - Masahiro Todoh
- Biomechanical Design Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 061-0819, Japan;
| | - Toshiyuki Akazawa
- Industrial Technology and Environment Research Development, Hokkaido Research Organization, Kita 19-jo Nishi 11-chome, Kita-ku, Sapporo 060-0819, Japan;
| | - Masaru Murata
- Division of Oral Regenerative Medicine, School of Dentistry, Health Science University of Hokkaido, Kanazawa 061-0293, Japan; (B.Z.); (K.Y.); (M.A.K.)
- Correspondence: ; Tel.: +81-133-23-2921; Fax: +81-133-23-1429
| |
Collapse
|
11
|
Kabir MA, Hirakawa A, Zhu B, Yokozeki K, Shakya M, Huang B, Akazawa T, Todoh M, Murata M. Mechanical Properties of Human Concentrated Growth Factor (CGF) Membrane and the CGF Graft with Bone Morphogenetic Protein-2 (BMP-2) onto Periosteum of the Skull of Nude Mice. Int J Mol Sci 2021; 22:11331. [PMID: 34768759 PMCID: PMC8582862 DOI: 10.3390/ijms222111331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 11/25/2022] Open
Abstract
Concentrated growth factor (CGF) is 100% blood-derived, cross-linked fibrin glue with platelets and growth factors. Human CGF clot is transformed into membrane by a compression device, which has been widely used clinically. However, the mechanical properties of the CGF membranes have not been well characterized. The aims of this study were to measure the tensile strength of human CGF membrane and observe its behavior as a scaffold of BMP-2 in ectopic site over the skull. The tensile test of the full length was performed at the speed of 2mm/min. The CGF membrane (5 × 5 × 2 mm3) or the CGF/BMP-2 (1.0 μg) membrane was grafted onto the skull periosteum of nude mice (5-week-old, male), and harvested at 14 days after the graft. The appearance and size of the CGF membranes were almost same for 7 days by soaking at 4 °C in saline. The average values of the tensile strength at 0 day and 7 days were 0.24 MPa and 0.26 MPa, respectively. No significant differences of both the tensile strength and the elastic modulus were found among 0, 1, 3, and 7 days. Supra-periosteal bone induction was found at 14 days in the CGF/BMP-2, while the CGF alone did not induce bone. These results demonstrated that human CGF membrane could become a short-term, sticky fibrin scaffold for BMP-2, and might be preserved as auto-membranes for wound protection after the surgery.
Collapse
Affiliation(s)
- Md. Arafat Kabir
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Akihiro Hirakawa
- Biomechanical Design Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-0819, Japan; (A.H.); (M.T.)
| | - Bowen Zhu
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Kenji Yokozeki
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Mamata Shakya
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| | - Bingzhen Huang
- Corefront Corporation, 2-11 Ichitanihonmura-cho, Shinjuku-ku, Tokyo 162-0845, Japan;
| | - Toshiyuki Akazawa
- Industrial Technology and Environment Research Development, Hokkaido Research Organization, Kita 19-jo Nishi 11-chome, Kita-ku, Sapporo 060-0819, Japan;
| | - Masahiro Todoh
- Biomechanical Design Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-0819, Japan; (A.H.); (M.T.)
| | - Masaru Murata
- Division of Oral Regenerative Medicine, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa 061-0293, Japan; (M.A.K.); (B.Z.); (K.Y.); (M.S.)
| |
Collapse
|
12
|
Zhao L, He X, Todoh M. Mechanical behavior of biomimetically mineralized collagen matrix using the polymer - induced liquid precursor process. J Biomech 2020; 104:109738. [PMID: 32188573 DOI: 10.1016/j.jbiomech.2020.109738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 02/29/2020] [Accepted: 02/29/2020] [Indexed: 11/30/2022]
Abstract
Biomimetic mineralization is a promising technique in biomedical applications. To understand the mechanical behavior of biomimetically mineralized collagen material (BMC), we examined the composition and structure of the mineral deposition in BMCs mineralized by the polymer-induced liquid precursor (PILP) process and applied wide angle x-ray scattering (WAXS) with in situ tensile testing to investigate the mineral-to-tissue co-deformation in the material. We found that the PILP process is able to achieve good biomimetic mineralization in bulk collagen matrix. Compositionally, the mineral deposition showed high crystallinity with no carbonation. However, the morphology of extrafibrillar mineral deposition and the preferential crystal orientation were different from natural bone. Further, the Young's modulus and mineral-to-tissue co-deformation ratio of the BMC were significantly lower than both natural bone and partially demineralized bone with similar mineral volume fraction. It was concluded that while biomimetic mineralization can achieve good mineral deposition volume in the BMC, the mechanical behavior of the material was different from natural bone.
Collapse
Affiliation(s)
- Lei Zhao
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Japan.
| | - Xingming He
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Japan
| | - Masahiro Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Japan
| |
Collapse
|
13
|
Endo K, Takahata M, Sugimori H, Yamada S, Tadano S, Wang J, Todoh M, Ito YM, Takahashi D, Kudo K, Iwasaki N. Magnetic resonance imaging T1 and T2 mapping provide complementary information on the bone mineral density regarding cancellous bone strength in the femoral head of postmenopausal women with osteoarthritis. Clin Biomech (Bristol, Avon) 2019; 65:13-18. [PMID: 30928786 DOI: 10.1016/j.clinbiomech.2019.03.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 01/30/2019] [Accepted: 03/18/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Since bone mass is not the only determinant of bone strength, there has been increasing interest in incorporating the bone quality into fracture risk assessments. We aimed to examine whether the magnetic resonance imaging (MRI) T1 or T2 mapping value could provide information that is complementary to bone mineral density for more accurate prediction of cancellous bone strength. METHODS Four postmenopausal women with hip osteoarthritis underwent 3.0-T MRI to acquire the T1 and T2 values of the cancellous bone of the femoral head before total hip arthroplasty. After the surgery, the excised femoral head was portioned into multiple cubic cancellous bone specimens with side of 5 mm, and the specimens were then subjected to microcomputed tomography followed by biomechanical testing. FINDINGS The T1 value positively correlated with the yield stress (σy) and collapsed stress (σc). The T2 value did not correlate with the yield stress, but it correlated with the collapsed stress and strength reduction ratio (σc/σy), which reflects the progressive re-fracture risk. Partial correlation coefficient analyses, after adjusting for the bone mineral density, showed a statistically significant correlation between T1 value and yield stress. The use of multiple coefficients of determination by least squares analysis emphasizes the superiority of combining the bone mineral density and the MRI mapping values in predicting the cancellous bone strength compared with the bone mineral density-based prediction alone. INTERPRETATION The MRI T1 and T2 values predict cancellous bone strength including the change in bone quality.
Collapse
Affiliation(s)
- Kaori Endo
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masahiko Takahata
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
| | | | - Satoshi Yamada
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Shigeru Tadano
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Jeffrey Wang
- Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan
| | - Masahiro Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Yoichi M Ito
- Department of Statistical Science, The Institute of Statistical Mathematics, Tokyo, Japan
| | - Daisuke Takahashi
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Kohsuke Kudo
- Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Japan
| | - Norimasa Iwasaki
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| |
Collapse
|
14
|
Tsujimoto T, Sudo H, Todoh M, Yamada K, Iwasaki K, Ohnishi T, Hirohama N, Nonoyama T, Ukeba D, Ura K, Ito YM, Iwasaki N. An acellular bioresorbable ultra-purified alginate gel promotes intervertebral disc repair: A preclinical proof-of-concept study. EBioMedicine 2018; 37:521-534. [PMID: 30389504 PMCID: PMC6286260 DOI: 10.1016/j.ebiom.2018.10.055] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 10/14/2018] [Accepted: 10/23/2018] [Indexed: 12/11/2022] Open
Abstract
Background The current surgical procedure of choice for lumbar intervertebral disc (IVD) herniation is discectomy. However, defects within IVD produced upon discectomy may impair tissue healing and predispose patients to subsequent IVD degeneration. This study aimed to investigate whether the use of an acellular bioresorbable ultra-purified alginate (UPAL) gel implantation system is safe and effective as a reparative therapeutic strategy after lumbar discectomy. Methods Human IVD cells were cultured in a three-dimensional system in UPAL gel. In addition, lumbar spines of sheep were used for mechanical analysis. Finally, the gel was implanted into IVD after discectomy in rabbits and sheep in vivo. Findings The UPAL gel was biocompatible with human IVD cells and promoted extracellular matrix production after discectomy, demonstrating sufficient biomechanical characteristics without material protrusion. Interpretation The present results indicate the safety and efficacy of UPAL gels in a large animal model and suggest that these gels represent a novel therapeutic strategy after discectomy in cases of lumbar IVD herniation. Fund Grant-in-Aid for the Ministry of Education, Culture, Sports, Science, and Technology of Japan, Japan Agency for Medical Research and Development, and the Mochida Pharmaceutical Co., Ltd.
Collapse
Affiliation(s)
- Takeru Tsujimoto
- Faculty of Medicine and Graduate of Medicine, Department of Orthopedic Surgery, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| | - Hideki Sudo
- Faculty of Medicine and Graduate of Medicine, Department of Advanced Medicine for Spine and Spinal Cord Disorders, Hokkaido University, N15W7, Sapporo 060-8638, Hokkaido, Japan.
| | - Masahiro Todoh
- Faculty of Engineering, Division of Human Mechanical Systems and Design, Hokkaido University, N13W8, Sapporo, Hokkaido 060-8628, Japan
| | - Katsuhisa Yamada
- Faculty of Medicine and Graduate of Medicine, Department of Orthopedic Surgery, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| | - Koji Iwasaki
- Faculty of Medicine and Graduate of Medicine, Department of Orthopedic Surgery, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| | - Takashi Ohnishi
- Faculty of Medicine and Graduate of Medicine, Department of Orthopedic Surgery, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| | - Naoki Hirohama
- Faculty of Engineering, Division of Human Mechanical Systems and Design, Hokkaido University, N13W8, Sapporo, Hokkaido 060-8628, Japan
| | - Takayuki Nonoyama
- Faculty of Advanced Life Science, Division of Advanced Transdisciplinary Sciences, Hokkaido University, N21W11, Sapporo, Hokkaido 001-0021, Japan
| | - Daisuke Ukeba
- Faculty of Medicine and Graduate of Medicine, Department of Orthopedic Surgery, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| | - Katsuro Ura
- Faculty of Medicine and Graduate of Medicine, Department of Orthopedic Surgery, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| | - Yoichi M Ito
- Department of Biostatistics, Graduate School of Medicine, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| | - Norimasa Iwasaki
- Faculty of Medicine and Graduate of Medicine, Department of Orthopedic Surgery, Hokkaido University, N15W7, Sapporo, Hokkaido 060-8638, Japan
| |
Collapse
|
15
|
Shimizu T, Takahata M, Kimura-Suda H, Kameda Y, Endo K, Hamano H, Hiratsuka S, Ota M, Sato D, Ito T, Todoh M, Tadano S, Iwasaki N. Autoimmune arthritis deteriorates bone quantity and quality of periarticular bone in a mouse model of rheumatoid arthritis. Osteoporos Int 2017; 28:709-718. [PMID: 27704183 DOI: 10.1007/s00198-016-3781-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 09/15/2016] [Indexed: 11/29/2022]
Abstract
UNLABELLED This study showed that autoimmune arthritis induces especially severe osteoporosis in the periarticular region adjacent to inflamed joints, suggesting that arthritis increases the fragility fracture risk near inflamed joints, which is frequently observed in patients with RA. INTRODUCTION Periarticular osteoporosis near inflamed joints is a hallmark of early rheumatoid arthritis (RA). Here we show that rheumatic inflammation deteriorates the bone quality and bone quantity of periarticular bone, thereby decreasing bone strength and toughness in a mouse model of RA. METHODS Female BALB/c mice and SKG mice, a mutant mouse model of autoimmune arthritis on the BALB/c background, were used. At 12 weeks of age, BALB/c mice underwent either Sham surgery or bilateral ovariectomy (OVX), and SKG mice underwent intraperitoneal injection of mannan to induce arthritis. Eight weeks later, the mice were killed and the femurs and tibias were subjected to micro-computed tomography, Fourier transform infrared (FTIR) spectroscopic imaging, X-ray diffraction, histology, and mechanical testing. RESULTS SKG mice developed significant trabecular bone loss in both the distal metaphysis of the femur and the lumbar vertebral body, but the extent of the bone loss was more severe in the distal metaphysis. Neither SKG nor OVX mice exhibited changes in the geometry and matrix properties of the diaphysis of the femur, whereas SKG mice, but not OVX mice, did exhibit changes in these properties in the distal metaphysis of the femur. Bone strength and fracture toughness of the distal metaphysis of the tibia adjacent to the inflamed ankle joint were significantly decreased in SKG mice. CONCLUSIONS Autoimmune arthritis induces periarticular osteoporosis, characterized by deterioration of cortical bone geometry and quality as well as by trabecular bone loss, leading to severe bone fragility in periarticular bone adjacent to inflamed joints.
Collapse
Affiliation(s)
- T Shimizu
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - M Takahata
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan.
| | - H Kimura-Suda
- Chitose Institute of Science and Technology, Chitose, Japan
| | - Y Kameda
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - K Endo
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - H Hamano
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - S Hiratsuka
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - M Ota
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - D Sato
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| | - T Ito
- Chitose Institute of Science and Technology, Chitose, Japan
| | - M Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - S Tadano
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - N Iwasaki
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060-8638, Japan
| |
Collapse
|
16
|
Tanaka E, Kawai N, Tanaka M, Todoh M, van Eijden T, Hanaoka K, Dalla-Bona DA, Takata T, Tanne K. The Frictional Coefficient of the Temporomandibular Joint and Its Dependency on the Magnitude and Duration of Joint Loading. J Dent Res 2016; 83:404-7. [PMID: 15111633 DOI: 10.1177/154405910408300510] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In synovial joints, friction between articular surfaces leads to shear stress within the cartilaginous tissue, which might result in tissue rupture and failure. Joint friction depends on synovial lubrication of the articular surfaces, which can be altered due to compressive loading. Therefore, we hypothesized that the frictional coefficient of the temporomandibular joint (TMJ) is affected by the magnitude and duration of loading. We tested this by measuring the frictional coefficient in 20 intact porcine TMJs using a pendulum-type friction tester. The mean frictional coefficient was 0.0145 (SD 0.0027) after a constant loading of 50 N during 5 sec. The frictional coefficient increased with the length of the preceding loading duration and exceeded 0.0220 (SD 0.0014) after 1 hr. Application of larger loading (80 N) resulted in significantly larger frictional coefficients. In conclusion, the frictional coefficient in the TMJ was proportional to the magnitude and duration of joint loading.
Collapse
Affiliation(s)
- E Tanaka
- Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Endo K, Yamada S, Todoh M, Takahata M, Iwasaki N, Tadano S. Structural strength of cancellous specimens from bovine femur under cyclic compression. PeerJ 2016; 4:e1562. [PMID: 26855856 PMCID: PMC4741075 DOI: 10.7717/peerj.1562] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 12/14/2015] [Indexed: 11/20/2022] Open
Abstract
The incidence of osteoporotic fractures was estimated as nine million worldwide in 2000, with particular occurrence at the proximity of joints rich in cancellous bone. Although most of these fractures spontaneously heal, some fractures progressively collapse during the early post-fracture period. Prediction of bone fragility during progressive collapse following initial fracture is clinically important. However, the mechanism of collapse, especially the gradual loss of the height in the cancellous bone region, is not clearly proved. The strength of cancellous bone after yield stress is difficult to predict since structural and mechanical strength cannot be determined a priori. The purpose of this study was to identify whether the baseline structure and volume of cancellous bone contributed to the change in cancellous bone strength under cyclic loading. A total of fifteen cubic cancellous bone specimens were obtained from two 2-year-old bovines and divided into three groups by collection regions: femoral head, neck, and proximal metaphysis. Structural indices of each 5-mm cubic specimen were determined using micro-computed tomography. Specimens were then subjected to five cycles of uniaxial compressive loading at 0.05 mm/min with initial 20 N loading, 0.3 mm displacement, and then unloading to 0.2 mm with 0.1 mm displacement for five successive cycles. Elastic modulus and yield stress of cancellous bone decreased exponentially during five loading cycles. The decrease ratio of yield stress from baseline to fifth cycle was strongly correlated with bone volume fraction (BV/TV, r = 0.96, p < 0.01) and structural model index (SMI, r = − 0.81, p < 0.01). The decrease ratio of elastic modulus from baseline to fifth cycle was also correlated with BV/TV (r = 0.80, p < 0.01) and SMI (r = − 0.78, p < 0.01). These data indicate that structural deterioration of cancellous bone is associated with bone strength after yield stress. This study suggests that baseline cancellous bone structure estimated from adjacent non-fractured bone contributes to the cancellous bone strength during collapse.
Collapse
Affiliation(s)
- Kaori Endo
- Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Satoshi Yamada
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University , Sapporo , Japan
| | - Masahiro Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University , Sapporo , Japan
| | - Masahiko Takahata
- Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Norimasa Iwasaki
- Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Shigeru Tadano
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University , Sapporo , Japan
| |
Collapse
|
18
|
Baba R, Onodera T, Momma D, Matsuoka M, Hontani K, Elmorsy S, Endo K, Todoh M, Tadano S, Iwasaki N. A Novel Bone Marrow Stimulation Technique Augmented by Administration of Ultrapurified Alginate Gel Enhances Osteochondral Repair in a Rabbit Model. Tissue Eng Part C Methods 2015; 21:1263-73. [PMID: 26414601 DOI: 10.1089/ten.tec.2015.0128] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Cartilage injuries are a common health problem resulting in the loss of daily activities. Bone marrow stimulation technique, one of the surgical techniques for the cartilage injuries, is characterized by technical simplicity and less invasiveness. However, it has been shown to result in fibrous or fibrocartilaginous repair with inferior long-term results. This study focused on using ultrapurified alginate gel (UPAL gel) as an adjuvant scaffold in combination with a bone marrow stimulation technique. The objective of this study was to assess the efficacy of a bone marrow stimulation technique augmented by UPAL gel in a rabbit osteochondral defect model. To achieve this goal, three experimental groups were prepared as follows: defects without intervention, defects treated with a bone marrow stimulation technique, and defects treated with a bone marrow stimulation technique augmented by UPAL gel. The macroscopic and histological findings of the defects augmented by UPAL gel improved significantly more than those of the others at 16 weeks postoperatively. The combination technique elicited hyaline-like cartilage repair, unlike bone marrow stimulation technique alone. This combination procedure has the potential of improving clinical outcomes after use of a bone marrow stimulation technique for articular cartilage injuries.
Collapse
Affiliation(s)
- Rikiya Baba
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| | - Tomohiro Onodera
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| | - Daisuke Momma
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| | - Masatake Matsuoka
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| | - Kazutoshi Hontani
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| | - Sameh Elmorsy
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| | - Kaori Endo
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| | - Masahiro Todoh
- 2 Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University , Sapporo, Japan
| | - Shigeru Tadano
- 2 Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University , Sapporo, Japan
| | - Norimasa Iwasaki
- 1 Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine , Sapporo, Japan
| |
Collapse
|
19
|
Tsukuda Y, Onodera T, Ito M, Izumisawa Y, Kasahara Y, Igarashi T, Ohzawa N, Todoh M, Tadano S, Iwasaki N. Therapeutic effects of intra-articular ultra-purified low endotoxin alginate administration on an experimental canine osteoarthritis model. J Biomed Mater Res A 2015; 103:3441-8. [PMID: 25904112 DOI: 10.1002/jbm.a.35490] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 04/12/2015] [Accepted: 04/15/2015] [Indexed: 11/10/2022]
Abstract
OBJECTIVE This study aimed to elucidate the therapeutic effects of intra-articular administration of ultra-purified low endotoxin alginate (UPLE-alginate) on osteoarthritis (OA) using a canine anterior cruciate ligament transection (ACLT) model. DESIGN We used 20 beagle dogs. ACLT was performed on the left knee of each dog and a sham operation was performed on the right knee as a control. All animals were randomly divided into the control (saline) and therapeutic (UPLE-alginate) groups. Animals in the control and therapeutic groups received weekly injections with 0.7 mL normal saline or 0.7 mL 0.5% UPLE-alginate, respectively, from 0 to 3 weeks after ACLT or sham operation. At 9 weeks after ACLT, the knee joints of all animals were observed using arthroscopy. All animals were euthanized at 14 weeks after ACLT and evaluated using morphologic assessment, histologic assessment, and biomechanical testing. RESULTS Arthroscopic findings showed intact cartilage surface in both groups. Morphologic findings in the therapeutic group showed milder degeneration compared with those of the control group, but there were no significant differences between groups. Histologic scores of the medial femoral condyle (MFC) and lateral femoral condyle (LFC) were better in the therapeutic group than the control group (MFC: p = 0.009, LFC: p = 0.009). Joint lubrication did not differ significantly between groups. CONCLUSION Intra-articular administration of UPLE-alginate in the early stage of OA slowed disease progression in canines. UPLE-alginate may have potential as a therapeutic agent for OA patients and reduce the number of patients who need to undergo total joint arthroplasty.
Collapse
Affiliation(s)
- Yukinori Tsukuda
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Tomohiro Onodera
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Masayuki Ito
- Department of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Japan
| | - Yasuharu Izumisawa
- Department of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Japan
| | - Yasuhiko Kasahara
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Tatsuya Igarashi
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Nobuo Ohzawa
- Business Development Division, Mochida Pharmaceutical Co., Ltd., Tokyo, Japan
| | - Masahiro Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Shigeru Tadano
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Norimasa Iwasaki
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| |
Collapse
|
20
|
Shimizu T, Takahata M, Kameda Y, Hamano H, Ito T, Kimura-Suda H, Todoh M, Tadano S, Iwasaki N. Vitamin K-dependent carboxylation of osteocalcin affects the efficacy of teriparatide (PTH(1-34)) for skeletal repair. Bone 2014; 64:95-101. [PMID: 24731926 DOI: 10.1016/j.bone.2014.04.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 03/16/2014] [Accepted: 04/04/2014] [Indexed: 01/02/2023]
Abstract
Teriparatide (PTH1-34) promotes skeletal repair and increases bone mass. Vitamin K is involved in bone mineralization as a coenzyme of γ-carboxylase for Gla proteins, and therefore vitamin K insufficiency caused by malnutrition or therapeutic intake of the vitamin K antagonist warfarin could affect the efficacy of PTH1-34 therapy for bone repair. In the present study, we investigated whether vitamin K influences the efficacy of PTH1-34 therapy for bone repair in a rat osteotomy model. Female 12-week-old Sprague-Dawley rats were subjected to a closed midshaft osteotomy of the femur and randomized into four groups (n=10 per group): vehicle, PTH1-34 (daily 30 μg/kg/day subcutaneous injection)+solvent (orally, three times a week), PTH1-34+warfarin (0.4 mg/kg/day orally, three times a week), and PTH1-34+vitamin K2 (menatetrenone, 30 mg/kg/day orally, three times a week). Serum γ-carboxylated and uncarboxylated osteocalcin (Gla-OC and Glu-OC) levels and radiographic healing were monitored every 2 weeks. Skeletal repair was assessed by micro-computed tomography, mechanical testing, and histology at 8weeks after surgery. PTH1-34 amplified the osteotomy-induced increase in Gla-OC and improved the mechanical properties as well as the volumetric bone mineral tissue density of the fracture callus. Concurrent use of warfarin decreased the response to PTH1-34 therapy in terms of mechanical recovery, probably by impairing mineralization due to the lack of Gla-OC. Although the effects of combination therapy with PTH1-34 and vitamin K2 on bone repair did not significantly exceed those of PTH1-34 monotherapy in rats fed sufficient dietary vitamin K, postoperative Gla-OC levels were correlated with the mechanical properties of the osteotomized femur in PTH1-34-treated rats regardless of the use of warfarin or vitamin K2. These findings suggest the importance of vitamin K dependent γ-carboxylation of OC for realizing the full effects of PTH1-34 on skeletal repair.
Collapse
Affiliation(s)
- Tomohiro Shimizu
- Hokkaido University, Department of Orthopedic Surgery, School of Medicine, Sapporo, Japan
| | - Masahiko Takahata
- Hokkaido University, Department of Orthopedic Surgery, School of Medicine, Sapporo, Japan.
| | - Yusuke Kameda
- Hokkaido University, Department of Orthopedic Surgery, School of Medicine, Sapporo, Japan
| | - Hiroki Hamano
- Hokkaido University, Department of Orthopedic Surgery, School of Medicine, Sapporo, Japan
| | - Teppei Ito
- Chitose Institute of Science of Technology, Chitose, Japan
| | | | - Masahiro Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Shigeru Tadano
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Norimasa Iwasaki
- Hokkaido University, Department of Orthopedic Surgery, School of Medicine, Sapporo, Japan
| |
Collapse
|
21
|
Elmorsy S, Funakoshi T, Sasazawa F, Todoh M, Tadano S, Iwasaki N. Chondroprotective effects of high-molecular-weight cross-linked hyaluronic acid in a rabbit knee osteoarthritis model. Osteoarthritis Cartilage 2014; 22:121-7. [PMID: 24185110 DOI: 10.1016/j.joca.2013.10.005] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 10/10/2013] [Accepted: 10/22/2013] [Indexed: 02/02/2023]
Abstract
OBJECTIVES We hypothesized that high-molecular-weight (MW) cross-linked (CL) hyaluronic acid (HA) improves joint lubrication and has an enhanced chondroprotective effect. We examined the histopathological changes and friction coefficients in osteoarthritic knee joints after injecting high-MW CL HA. DESIGN A bilateral anterior cruciate ligament transection (ACLT) model in 20 Japanese white rabbits was used. From week 5 after transection, low-MW HA (0.8 × 10(6) Da; HA80) or high-MW CL HA (6 × 10(6) Da; HA600) was injected weekly into 10 right knee for 3 weeks; normal saline (NS) was injected into the 10 left knee. A sham operation was undertaken to exclude spontaneous osteoarthritis (OA) in five knees. Results were evaluated with macroscopy, histopathology (Kikuchi's score), biomechanical testing, and rheological assessment of the joint fluid viscoelasticity. Statistical analysis was performed using one-way analysis of variance with a 95% confidence interval (CI) (P < 0.05). RESULTS The macroscopic findings showed severely damaged cartilage in 30% of the NS group and 20% of the HA80 and HA600 groups and intact cartilage in 100% of the sham group. The histological scores and friction coefficients of the HA600 group were significantly lower than those of the NS group (P = 0.007 and P = 0.002, respectively). Viscoelasticity measurements of the joint fluid showed no significant differences between the three treatment groups. CONCLUSION High-MW CL HA exerts potential chondroprotective effects and produces superior friction coefficients. Our results suggest that HA600 delays the progression of OA effectively and improves joint lubrication significantly.
Collapse
Affiliation(s)
- S Elmorsy
- Department of Orthopaedic Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
| | - T Funakoshi
- Department of Orthopaedic Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
| | - F Sasazawa
- Department of Orthopaedic Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
| | - M Todoh
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, Sapporo, Japan.
| | - S Tadano
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, Sapporo, Japan.
| | - N Iwasaki
- Department of Orthopaedic Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
| |
Collapse
|
22
|
Fujisaki K, Todoh M, Niida A, Shibuya R, Kitami S, Tadano S. Orientation and deformation of mineral crystals in tooth surfaces. J Mech Behav Biomed Mater 2012; 10:176-82. [DOI: 10.1016/j.jmbbm.2012.02.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 02/23/2012] [Accepted: 02/27/2012] [Indexed: 10/28/2022]
|
23
|
Igarashi T, Iwasaki N, Kawamura D, Tsukuda Y, Kasahara Y, Todoh M, Tadano S, Minami A. Therapeutic Effects of Intra-Articular Ultrapurified Low Endotoxin Alginate Administration on Experimental Osteoarthritis in Rabbits. Cartilage 2012; 3:70-8. [PMID: 26069620 PMCID: PMC4297190 DOI: 10.1177/1947603511418959] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE We have developed an ultrapurified low endotoxin alginate (UPLE alginate), which can drastically reduce endotoxin levels. Our purposes were to examine the effects of UPLE alginate administration on osteoarthritis (OA) progression and to determine the adequate molecular weight of the UPLE alginate for therapeutic effects. DESIGN To induce knee OA, 35 Japanese White rabbits underwent anterior cruciate ligament transection. Intra-articular injections of 0.3 mL solution of each material were started at 4 weeks postoperatively for a total of 5 weekly injections. Seventy knees were divided into the following groups: AL430 (430 kDa molecular weight UPLE alginate), AL1000 (1,000 kDa), AL1700 (1,700 kDa), HA (hyaluronan), and NS (normal saline). At 9 weeks postoperatively, all knees were assessed macroscopically, histologically, and mechanically. RESULTS Macroscopically, the UPLE alginate groups exhibited milder cartilage degradation compared to that of the NS and HA groups. Histological findings of the UPLE alginate groups showed an obvious reduction in the severity of OA. The histological scores of Kikuchi et al. were superior in the alginate treatment groups compared to the NS group. The friction coefficient of the AL1000 group was significantly lower than that of the NS and HA groups. CONCLUSION This study indicates that our UPLE alginates, especially AL1000, have promising potential as an effective agent in preventing OA progression.
Collapse
Affiliation(s)
- Tatsuya Igarashi
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Norimasa Iwasaki
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Daisuke Kawamura
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Yukinori Tsukuda
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Yasuhiko Kasahara
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| | - Masahiro Todoh
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Shigeru Tadano
- Division of Human Mechanical Systems and Design, Faculty of Engineering, Hokkaido University, Sapporo, Japan
| | - Akio Minami
- Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
| |
Collapse
|
24
|
Takeda R, Tadano S, Natorigawa A, Todoh M, Yoshinari S. Gait posture estimation using wearable acceleration and gyro sensors. J Biomech 2009; 42:2486-94. [PMID: 19682694 DOI: 10.1016/j.jbiomech.2009.07.016] [Citation(s) in RCA: 128] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Revised: 07/12/2009] [Accepted: 07/13/2009] [Indexed: 11/29/2022]
Abstract
A method for gait analysis using wearable acceleration sensors and gyro sensors is proposed in this work. The volunteers wore sensor units that included a tri-axis acceleration sensor and three single axis gyro sensors. The angular velocity data measured by the gyro sensors were used to estimate the translational acceleration in the gait analysis. The translational acceleration was then subtracted from the acceleration sensor measurements to obtain the gravitational acceleration, giving the orientation of the lower limb segments. Segment orientation along with body measurements were used to obtain the positions of hip, knee, and ankle joints to create stick figure models of the volunteers. This method can measure the three-dimensional positions of joint centers of the hip, knee, and ankle during movement. Experiments were carried out on the normal gait of three healthy volunteers. As a result, the flexion-extension (F-E) and the adduction-abduction (A-A) joint angles of the hips and the flexion-extension (F-E) joint angles of the knees were calculated and compared with a camera motion capture system. The correlation coefficients were above 0.88 for the hip F-E, higher than 0.72 for the hip A-A, better than 0.92 for the knee F-E. A moving stick figure model of each volunteer was created to visually confirm the walking posture. Further, the knee and ankle joint trajectories in the horizontal plane showed that the left and right legs were bilaterally symmetric.
Collapse
Affiliation(s)
- Ryo Takeda
- Division of Human Mechanical Systems and Design, Graduate School of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo 060-8628, Japan
| | | | | | | | | |
Collapse
|
25
|
Takeda R, Tadano S, Todoh M, Morikawa M, Nakayasu M, Yoshinari S. Gait analysis using gravitational acceleration measured by wearable sensors. J Biomech 2009; 42:223-33. [DOI: 10.1016/j.jbiomech.2008.10.027] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Revised: 10/28/2008] [Accepted: 10/28/2008] [Indexed: 11/26/2022]
|
26
|
Todoh M, Tadano S, Kitagawa H. Development of Horizontal Seat Adjustment System for Electric-Powered Wheelchairs. J Biomech 2007. [DOI: 10.1016/s0021-9290(07)70457-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
27
|
Giri B, Fujisaki K, Todoh M, Tadano S. RESIDUAL STRESS ESTIMATION OF BONE TISSUE USING X-RAY IMAGING TECHNIQUE. J Biomech 2007. [DOI: 10.1016/s0021-9290(07)70366-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
28
|
Giri B, Tadano S, Todoh M, Fujisaki K. Microstructure of cortical bone around the foramen in bovine lumbar vertebra. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)84813-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
29
|
Matsumoto T, Yoshino M, Asano T, Uesugi K, Todoh M, Tanaka M. Monochromatic synchrotron radiation μCT reveals disuse-mediated canal network rarefaction in cortical bone of growing rat tibiae. J Appl Physiol (1985) 2006; 100:274-80. [PMID: 16141381 DOI: 10.1152/japplphysiol.00495.2005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The purpose of this study was to demonstrate the ability of computed microtomography based on monochromatic synchrotron radiation (SRμCT) in microstructural analysis of cortical bone. Tibial diaphyses of growing rats (14 wk, n = 8) undergoing unilateral sciatic neurectomy 8 wk before study were imaged with spatial volume resolution of 5.83 × 5.83 × 5.83 μm3 by SRμCT (20 keV) at the synchrotron radiation facility (SPring-8). Reconstructed image data were translated into local mineral densities by using a calibrated linear relationship between linear absorption coefficients and concentrations of homogeneous K2HPO4 solution. Pure bone three-dimensional images, produced by simple thresholding at a bone mineral density of 0.82 g/cm3, were analyzed for macro- and microscopic structural properties. In neurectomized hindlimbs, cortical canal network rarefaction as well as bone atrophy were found. The former was characterized by 30% smaller porosity, 11% smaller canal density in transverse section, and 38% smaller canal connectivity density than those in contralateral bone. On the other hand, no difference was found in bone mineral density between neurectomized and intact hindlimbs (1.37 vs. 1.36 g/cm3). In conclusion, SRμCT is a promising method for the three-dimensional analysis of cortical microstructure and the degree of mineralization in small animals.
Collapse
Affiliation(s)
- Takeshi Matsumoto
- Division of Bioengineering, Osaka University Graduate School of Engineering Science, Toyonaka, Japan.
| | | | | | | | | | | |
Collapse
|
30
|
Matsumoto T, Asano T, Mano K, Tachibana H, Todoh M, Tanaka M, Kajiya F. Regional myocardial perfusion under exchange transfusion with liposomal hemoglobin: in vivo and in vitro studies using rat hearts. Am J Physiol Heart Circ Physiol 2005; 288:H1909-14. [PMID: 15576434 DOI: 10.1152/ajpheart.00976.2004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The purpose of this study was to test the hypothesis that exchange transfusion with liposomal hemoglobin (LH) reduces the microheterogeneity of regional myocardial flows while sustaining cardiac function. Neo Red Cell mixed with albumin was used as the LH solution, in which the LH volume fraction was 17∼18% and hemoglobin density was nearly two-thirds smaller than in rat blood. Regional myocardial flows in left ventricular free walls were measured by tracer digitalradiography (100-μm resolution) in anesthetized rats with or without 50% blood-LH exchange transfusion. Within-layer flow distributions showed lower heterogeneity with ( n = 8) than without ( n = 8) LH transfusion. No extravasation of hemoglobin was confirmed by 3,3-diaminobenzidin staining ( n = 2). Carotid flow increased by 68% due to LH transfusion, whereas arterial pressure and heart rate remained unchanged. On the other hand, cross-circulated rat hearts ( n = 7) were used to evaluate the effects of 50% blood-LH exchange on coronary flow and tone preservation under 300-beats/min pacing and 100-mmHg perfusion pressure. Blood-LH exchange caused a 71% increase of coronary flow and 10% decrease of percent flow increase during hyperemia after 30-s flow interruption. Myocardial O2 supply and consumption increased by 9% and 10%, respectively, whereas myocardial O2 extraction remained unchanged. The large increases of in vivo carotid flow and coronary flow in cross-circulated hearts due to LH coperfusion could be explained by the reduction of apparent flow viscosity. These results suggest that under LH coperfusion, the microheterogeneity of myocardial flows decreases with increased coronary flow while fairly preserving coronary tone and cardiac function.
Collapse
Affiliation(s)
- T Matsumoto
- Division of Bioengineering, Osaka University Graduate School of Engineering Science, Machikaneyama-machi 1-3, Toyonaka 560-8531, Japan.
| | | | | | | | | | | | | |
Collapse
|
31
|
Kawai N, Tanaka E, Takata T, Miyauchi M, Tanaka M, Todoh M, van Eijden T, Tanne K. Influence of additive hyaluronic acid on the lubricating ability in the temporomandibular joint. J Biomed Mater Res A 2004; 70:149-53. [PMID: 15174119 DOI: 10.1002/jbm.a.30078] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In synovial fluid, hyaluronic acid (HA) is an essential component for the lubrication of joints, thus preventing friction. The relationship between HA and joint friction is not unambiguously established yet. In the present study, the effect of the application of HA on the frictional coefficient in the temporomandibular joint was evaluated. After measuring the frictional coefficient in intact porcine joints (n = 10), the subsequent effect of phosphate-buffered saline (PBS) washing and gauze scouring and the application of HA was examined. Compared with the intact joint, the frictional coefficient was significantly larger after PBS washing and gauze scouring. Subsequent application of HA resulted in a significant decrease (50-75%) of the frictional coefficient. However, it did not recover to the same value as in the intact joints. Observations by scanning electron microscopy showed that after PBS washing, the amorphous layer of the articular cartilage was still intact, whereas it was partially collapsed after gauze scouring. In conclusion, the addition of HA did reduce the coefficient of friction under the experimental conditions in this study; the relevance to the clinical condition and the duration of the treatment effect in vivo require further investigation.
Collapse
Affiliation(s)
- Nobuhiko Kawai
- Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
| | | | | | | | | | | | | | | |
Collapse
|