1
|
Palka M, Miszczyk P, Jurewicz M, Perz R. Finite element method analysis of bone stress for variants of locking plate placement. Heliyon 2024; 10:e26840. [PMID: 38660239 PMCID: PMC11039970 DOI: 10.1016/j.heliyon.2024.e26840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 02/15/2024] [Accepted: 02/20/2024] [Indexed: 04/26/2024] Open
Abstract
This study investigates the optimal placement of locking plate screws for bone fracture stabilization in the humerus, a crucial factor for enhancing healing outcomes and patient comfort. Utilizing Finite Element Method (FEM) modeling, the research aimed to determine the most effective screw configuration for achieving optimal stress distribution in the humerus bone. A computer tomography (CT) scan of the humerus was performed, and the resulting images were used to create a detailed model in SOLIDWORKS 2012. This model was then analyzed using ANSYS Workbench V13 to develop a finite element model of the bone. Four different screw configurations were examined: 4 × 0°, 4 × 10°, 4 × 20°, 2 × 20°; 2 × 0°. These configurations were subjected to bending in the XZ and YZ planes, as well as tension and compression along the Z axis. The research identified the 2 × 20°+2 × 0° configuration as the most beneficial, with average stress values below 30 MPa and peak stress values below 50 MPa in 3-point bending at the first screw. This configuration consistently showed the lowest stress values across all loading scenarios. Specifically, stress levels ranged from 20 MPa to 50 MPa for bending in the XZ plane, 20 MPa-35 MPa for bending in the YZ plane, 20 MPa-30 MPa for extension in the Z-axis, and 18 MPa-25 MPa for compression in the Z-axis. The 4 × 10° and 4 × 20° configurations also produced satisfactory results, with stress levels not exceeding 70 MPa. However, the 4 × 0° configuration presented considerable stress during bending and compression in the Z-axis, with stress values exceeding 100 MPa, potentially leading to mechanical damage. In conclusion, the 2 × 20°; 2 × 0° screw configuration was identified as the most effective in minimizing stress on the treated bone. Future work will involve a more detailed analysis of this methodology and its potential integration into clinical practice, with a focus on enhancing patient outcomes in bone fracture treatment.
Collapse
Affiliation(s)
- Marek Palka
- Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Nowowiejska 24, 00-660, Warsaw, Poland
| | - Patrycja Miszczyk
- Faculty of Medicine, Medical University of Warsaw, Żwirki i Wigury 61, 02-091, Warsaw, Poland
| | - Maciej Jurewicz
- Faculty of Applied Informatics and Mathematics, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776, Warsaw, Poland
| | - Rafal Perz
- Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Nowowiejska 24, 00-660, Warsaw, Poland
| |
Collapse
|
2
|
Adamović P, Matoc L, Knežević P, Sabalić S, Kodvanj J. Biomechanical analysis of a novel screw system with a variable locking angle in mandible angle fractures. Med Biol Eng Comput 2023; 61:2951-2961. [PMID: 37535297 DOI: 10.1007/s11517-023-02895-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 07/19/2023] [Indexed: 08/04/2023]
Abstract
Locking plates nowadays represent an important treatment in bone trauma and bone healing due to its strong biomechanical properties. The purpose of this study was to both computationally and experimentally validate a novel screw locking system by comparing it to another locking system from state-of-the-art and to apply it in an environment of a fractured mandible. FEA was used to test both systems prior to experimental tests. The systems were locked in the plate holes at 0°, 10°, 15°, and 20°. Cyclic bending tests and push-out tests were performed in order to determine the stiffness and push-out forces of both locking systems. Finally, newly designed locking system was implemented in mandibular angle fracture. Control locking system was biomechanically superior in push-out test, but with no greater significance. In contrast, the new locking system showed greater stiffness by 17.3% at the deflection angle of 20° in cyclic tests, with lower values for other deflection angles. Similar values were displayed in fractured mandible angle environment. Greater stiffness of the new locking system in cyclic loading tests, together with polyaxiallity of the new locking screw, could lead to easier application and improved biomechanical stability of the mandible angle fractures.
Collapse
Affiliation(s)
- Petra Adamović
- Experimental Mechanics Laboratory, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000, Zagreb, Croatia
| | - Lovro Matoc
- Department of Maxillofacial Surgery, University Hospital Centre Zagreb, Kišpatićeva Ulica 12, 10000, Zagreb, Croatia.
| | - Predrag Knežević
- Department of Maxillofacial and Oral Surgery, Dubrava University Hospital, Avenija Gojka Šuška 6, 10000, Zagreb, Croatia
| | - Srećko Sabalić
- Department of Traumatology, Sestre Milosrdnice University Hospital Center, Draškovićeva 19, 10000, Zagreb, Croatia
- School of Medicine, University of Split, Šoltanska 2, 21000, Split, Croatia
| | - Janoš Kodvanj
- Experimental Mechanics Laboratory, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000, Zagreb, Croatia
| |
Collapse
|
3
|
Zhong S, Shi Q, Van Dessel J, Gu Y, Sun Y, Yang S. Biomechanical validation of structural optimized patient-specific mandibular reconstruction plate orienting additive manufacturing. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 224:107023. [PMID: 35872386 DOI: 10.1016/j.cmpb.2022.107023] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 07/07/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND AND OBJECTIVE Owing to the unexpected in vivo fracture failure of the original design, structural optimized patient-specific mandibular reconstruction plates (PSMRPs) were created to boost the biomechanical performance of bridging segmental bony defect in the mandibular reconstruction after tumor resection. This work aimed to validate the biomechanical benefit of the structural optimized PSMRPs relative to the original design and compare the biomechanical performance between PSMRP1 with generic contour customization and PSMRP2 with a tangent arc upper margin in mandibular angle region. METHODS Finite Element Analysis (FEA) was used to evaluate the biomechanical behavior of mandibular reconstruction assemblies (MRAs) concerning these two structural optimized PSMRPs by simulating momentary left group clenching and incisal clenching tasks. Bonded contact was set between mandibular bone and fixation screws and between PSMRP and fixation screws in the MRA, while the frictionless connection was allocated between mandibular bone and PSMRP. The loads were applied on four principal muscles, including masseter, temporalis, lateral and medial pterygoid, whose magnitudes along the three orthogonal directions. The mandibular condyles were retrained in all three directions, and either the left molars or incisors area were restrained from moving vertically. RESULTS The peak von Mises stresses of structural optimized PSMRPs (264 MPa, 296 MPa) were way lower than that of the initial PSMRP design (393 MPa), with 33 and 25% reduction during left group clenching. The peak magnitude of von Mises stress, minimum principal stress, and maximum principal strain of PSMRP1 (264 MPa, 254 MPa; -297 MPa, -285 MPa; 0.0020, 0.0020) was lower than that of PSMRP2 (296 MPa, 286 MPa; -319 MPa, -306 MPa; 0.0022, 0.0020), while the peak maximum principal stress of PSMRP1 (275 MPa, 257 MPa) was higher than that of PSMRP2 (254 MPa, 235 MPa) during both left group clenching and incisal clenching tasks. CONCLUSIONS The structural optimized PSMRPs reveal their biomechanical advantage compared with the original design. The PSMRP1 presents better biomechanical performance to the patient-specific mandibular reconstruction than PSMRP2 as a result of its superior safety, preferable flexibility, and comparable stability. The PSMRP2 provides biomechanical benefit in reducing the maximum tension than PSMRP1, indicated by lower peak maximum principal stress, through tangent arc upper margin in mandibular angle region.
Collapse
Affiliation(s)
- Shengping Zhong
- Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, Leuven 3000, Belgium
| | - Qimin Shi
- Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, Leuven 3000, Belgium
| | - Jeroen Van Dessel
- Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, Leuven 3000, Belgium
| | - Yifei Gu
- Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, Leuven 3000, Belgium
| | - Yi Sun
- Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, Leuven 3000, Belgium.
| | - Shoufeng Yang
- Faculty of Engineering and Physical Sciences, Highfield, University of Southampton, Southampton SO17 1BJ, United Kingdom.
| |
Collapse
|
4
|
Jang JH, Rhee SJ, Jun SB, Choi YY. Scattering and clustering the proximal screw construct in unilateral locking plate osteosynthesis of distal femoral fractures. Arch Orthop Trauma Surg 2022; 142:2193-2203. [PMID: 34018021 DOI: 10.1007/s00402-021-03912-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/12/2021] [Indexed: 11/30/2022]
Abstract
INTRODUCTION The importance of fixation construct in locking compression plate (LCP) is not well enlightened until recently. The aim of this study was to investigate radiological and clinical outcomes of scattering and clustering of the proximal screw fixation construct in unilateral LCP treatment of the distal femoral fractures. MATERIALS AND METHODS Patients who were treated for distal femoral fractures using unilateral LCP between January 2014 and December 2019 in our institute were included in this retrospective study. They were divided into groups 1 (35 cases, scattered proximal screw fixation) and 2 (35 cases, clustered proximal screw fixation). Mean follow-up period was 23.6 months for group 1 and 21.3 months for group 2. Medical history, patient demographics, injury characteristics, and surgical characteristics were reviewed and analyzed. Radiological findings including time to callus formation, bridging callus formation, union, and symmetry of the union were assessed and compared between the groups. Clinical outcomes included total blood loss during the operation, postoperative range of motion, and number of revision surgery. RESULTS The time for callus formation (5.8 weeks in group 1 vs. 4.1 weeks in group 2, p = 0.009) and bridging callus formation (12.5 weeks in group 1 vs. 10.7 weeks in group 2, p = 0.009) was significantly earlier in group 2. Despite similar union rates between groups, the mean time for radiological union was longer in group 2 (10.7 vs 7.4 months, p = 0.001). Though statistically insignificant, more asymmetric union was observed in group 2 (17 vs 11 cases). CONCLUSIONS Despite a delay in initial callus and bridging callus formation, scattering the proximal screws was better in achieving earlier and more balanced radiographic union than the clustered fixation. We recommend to avoid bridging more than five holes in the whole plate fixation construct to lessen the asymmetric callus formation and to prevent eventual plate breakage.
Collapse
Affiliation(s)
- Jae Hoon Jang
- Department of Orthopedic Surgery, Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan, 602-739, Korea
| | - Seung Joon Rhee
- Department of Orthopedic Surgery, Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan, 602-739, Korea.
| | - Se Bin Jun
- Department of Orthopedic Surgery, Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan, 602-739, Korea
| | - Yoon Young Choi
- Department of Diagnostic Radiology, Pusan National University Yangsan Hospital, Yangsan, Korea
| |
Collapse
|
5
|
Zhang S, Patel D, Brady M, Gambill S, Theivendran K, Deshmukh S, Swadener J, Junaid S, Leslie LJ. Experimental testing of fracture fixation plates: A review. Proc Inst Mech Eng H 2022; 236:1253-1272. [PMID: 35920401 PMCID: PMC9449446 DOI: 10.1177/09544119221108540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Metal and its alloys have been predominantly used in fracture fixation for
centuries, but new materials such as composites and polymers have begun to see
clinical use for fracture fixation during the past couple of decades. Along with
the emerging of new materials, tribological issues, especially debris, have
become a growing concern for fracture fixation plates. This article for the
first time systematically reviews the most recent biomechanical research, with a
focus on experimental testing, of those plates within ScienceDirect and PubMed
databases. Based on the search criteria, a total of 5449 papers were retrieved,
which were then further filtered to exclude nonrelevant, duplicate or
non-accessible full article papers. In the end, a total of 83 papers were
reviewed. In experimental testing plates, screws and simulated bones or cadaver
bones are employed to build a fixation construct in order to test the strength
and stability of different plate and screw configurations. The test set-up
conditions and conclusions are well documented and summarised here, including
fracture gap size, types of bones deployed, as well as the applied load, test
speed and test ending criteria. However, research on long term plate usage was
very limited. It is also discovered that there is very limited experimental
research around the tribological behaviour particularly on the debris’
generation, collection and characterisation. In addition, there is no identified
standard studying debris of fracture fixation plate. Therefore, the authors
suggested the generation of a suite of tribological testing standards on
fracture fixation plate and screws in the aim to answer key questions around the
debris from fracture fixation plate of new materials or new design and
ultimately to provide an insight on how to reduce the risks of debris-related
osteolysis, inflammation and aseptic loosening.
Collapse
Affiliation(s)
- Shiling Zhang
- Aston Institute of Materials Research (AIMR), Aston University, Birmingham, UK
| | - Dharmesh Patel
- Invibio Biomaterial Solutions Limited, Hillhouse International, Thornton-Cleveleys, UK
| | - Mark Brady
- Invibio Biomaterial Solutions Limited, Hillhouse International, Thornton-Cleveleys, UK
| | - Sherri Gambill
- Invibio Biomaterial Solutions Limited, Hillhouse International, Thornton-Cleveleys, UK
| | | | - Subodh Deshmukh
- Sandwell and West Birmingham Hospital NHS Trust, Birmingham, UK
| | - John Swadener
- Aston Institute of Materials Research (AIMR), Aston University, Birmingham, UK
| | - Sarah Junaid
- Aston Institute of Materials Research (AIMR), Aston University, Birmingham, UK
| | - Laura Jane Leslie
- Aston Institute of Materials Research (AIMR), Aston University, Birmingham, UK
| |
Collapse
|
6
|
A finite element study on femoral locking compression plate design using genetic optimization method. J Mech Behav Biomed Mater 2022; 131:105202. [DOI: 10.1016/j.jmbbm.2022.105202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 02/15/2022] [Accepted: 03/25/2022] [Indexed: 11/23/2022]
|
7
|
Osteosynthesis Metal Plate System for Bone Fixation Using Bicortical Screws: Numerical–Experimental Characterization. BIOLOGY 2022; 11:biology11060940. [PMID: 35741461 PMCID: PMC9219623 DOI: 10.3390/biology11060940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 05/26/2022] [Accepted: 06/10/2022] [Indexed: 11/17/2022]
Abstract
Simple Summary This study addresses an important issue concerning the evaluation of stresses in bone shafts stabilized by osteosynthesis metal plates, following routine surgical procedures to repair severe fractures in bone. It is recognized that bone regeneration following fracture is highly dictated by the stress state in the damaged regions. Since metallic inserts, like plates and screws, are usually employed to assure the stabilization of fractures in bone, it is important to evaluate the effect of those parts on the developed stresses in bone tissue. In the present work fracture was induced in a femoral bone of an animal model, which was suitably stabilized with a dynamic compression plate (DCP) using bicortical screws. This system was submitted to bending to trigger damage in bone tissue in the vicinity of metal inserts. Finite element modelling was then performed to mimic damage initiation and propagation in bone, thus simulating the results observed experimentally. Stress distributions in the vicinity of the screwed regions due to fastening of DCP allowed to identify very significant differences, which can affect bone hilling processes. It can be concluded that the developed procedure may be used to help surgeons to support decisions regarding bone repair using standard DCP. Abstract This study reports the numerical and experimental characterization of a standard immobilization system currently being used to treat simple oblique bone fractures of femoral diaphyses. The procedure focuses on the assessment of the mechanical behavior of a bone stabilized with a dynamic compression plate (DCP) in a neutralization function, associated to a lag screw, fastened with surgical screws. The non-linear behavior of cortical bone tissue was revealed through four-point bending tests, from which damage initiation and propagation occurred. Since screw loosening was visible during the loading process, damage parameters were measured experimentally in independent pull-out tests. A realistic numerical model of the DCP-femur setup was constructed, combining the evaluated damage parameters and contact pairs. A mixed-mode (I+II) trapezoidal damage law was employed to mimic the mechanical behavior of both the screw–bone interface and bone fractures. The numerical model replicated the global behavior observed experimentally, which was visible by the initial stiffness and the ability to preview the first loading peak, and bone crack satisfactorily.
Collapse
|
8
|
Zhang H, Sun F, Li Y. Application of Smart Healthcare in Comparative Analysis of Effect of Early External Fixator and Plate Internal Fixation Treatment on Postoperative Complications and Lower Limb Function Recovery of Patients With Unstable Pelvic Fracture. Front Public Health 2022; 10:887123. [PMID: 35570973 PMCID: PMC9099004 DOI: 10.3389/fpubh.2022.887123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 03/21/2022] [Indexed: 11/13/2022] Open
Abstract
ObjectiveTo comparatively analyze the effect of early external fixator and plate internal fixation treatment on postoperative complications and lower limb function recovery of patients with unstable pelvic fracture based on smart healthcare.MethodsThe clinical data of 98 patients with unstable pelvic fractures treated in our hospital from August 2018 to August 2021 were collected for retrospective analysis, and the patients were split into group A (plate internal fixation, n = 49) and group B (early external fixator treatment, n = 49) according to the surgical modalities. The time of operation, intraoperative blood loss, postoperative complications, etc. were compared between the two groups.ResultsBetween the two groups, group B had significantly better clinical indicators (P < 0.001), a greatly higher good rate of fracture reduction and postoperative Harris score (P < 0.05), and obviously lower VAS score and total incidence rate of postoperative complications (P < 0.05).ConclusionThrough the analysis based on smart healthcare, it is found that compared with plate internal fixation treatment, early external fixator treatment presents a better effect in treating patients with unstable pelvic fracture, because it is a reliable method to accelerate fracture healing, reduce postoperative complications, and improve lower limb function.
Collapse
Affiliation(s)
- Hongwei Zhang
- Department of Emergency, The First Affiliated Hospital of Jiamusi University, Jiamusi, China
| | - Fang Sun
- Plastic Burn Beauty Center, The First Affiliated Hospital of Jiamusi University, Jiamusi, China
| | - Yao Li
- Department of Orthopeadic Surgery, The First Affiliated Hospital of Jiamusi University, Jiamusi, China
- *Correspondence: Yao Li
| |
Collapse
|
9
|
Mohandes Y, Tahani M, Rouhi G. Osteosynthesis of diaphyseal tibia fracture with locking compression plates: A numerical investigation using Taguchi and ANOVA. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2021; 37:e3528. [PMID: 34486240 DOI: 10.1002/cnm.3528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 08/29/2021] [Indexed: 06/13/2023]
Abstract
Performance of the locking compression plate (LCP) is a multifactorial function. The control parameters of plating, such as geometries, material properties, and physical constraints of the LCP components, affect basic functions associated with the bone fixation, including the extent of stress shielding and subsequent bone remodeling, strength and stability of the bone-LCP construct, and performance of secondary bone healing. The main objectives of this research were as follows: (1) to find the appropriate values of control parameters of an LCP construct to achieve the optimized performance throughout bone healing; and (2) to unravel relationships between LCP parameters and the LCP's performance. Different values for the plate/screw modulus of elasticity (E), plate width (W), plate thickness (T), screw diameter (D), bone-plate offset (O), and screw configuration (C), as six control parameters, were considered at five different levels. Taguchi method was adopted to create trial combinations of control parameters and determining the best set of parameters, which can optimize the overall performance of the LCP. All design cases were analyzed using the finite element method. The optimal set of control parameters consisting of 150 GPa, 12 mm, 4 mm, 5.5 mm, 2 mm, and 123,678 were determined for E, W, T, D, O, and C, respectively. Furthermore, ANOVA was used to rank the most influential parameters on each function of the LCP fixation. In the overall performance of the LCP fixation, E, D, T, C, W, and O showed a contribution percentage of 46%, 22%, 10%, 11%, 8%, and 3%, respectively.
Collapse
Affiliation(s)
- Yousof Mohandes
- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Masoud Tahani
- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Gholamreza Rouhi
- Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
| |
Collapse
|
10
|
Kolasangiani R, Parchami K, Tahani M. Optimization of Connecting Rod Design Parameters for External Fixation System: A Biomechanical Study. J Foot Ankle Surg 2021; 60:1169-1174. [PMID: 34219014 DOI: 10.1053/j.jfas.2021.02.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 01/30/2021] [Accepted: 02/17/2021] [Indexed: 02/03/2023]
Abstract
The role of connecting rod in healing process of a fractured bone has always been of significant importance for surgeons. Adding a connecting rod to the fixator would be a secure option for increasing stability without increasing infection rate. The roles of 4 design parameters of the connecting rod (ie, connecting rod diameter, elevation, material, and configuration) were assessed by using finite element models to calculate axial stiffness and interfragmentary strain at the fracture gap. Taguchi method was used to achieve an optimal design set for maximizing stability with regard to connecting rod variables. Also, analysis of variance (ANOVA) approach was employed to determine contribution percentage of each design parameter on outputs. For optimizing connecting rod design parameters, an optimal set of variables consisting of 11 mm, 40 mm, 200 GPa, and Type 3 external fixator were determined by Taguchi for connecting rod diameter, elevation, modulus of elasticity, and configuration, respectively. However, as Type 3 external fixator stability is a little more than Type 2, it would be better if Type 3 external fixator in Taguchi suggestion be replaced by Type 2 external fixator to be as minimally invasive as possible. Furthermore, ANOVA results revealed that the connecting rod configuration is the most important parameter with 95% and 96% effectiveness on the interfragmentary strain and axial stiffness.
Collapse
Affiliation(s)
- Reza Kolasangiani
- Research Assistant, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Kiana Parchami
- Research Assistant, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Masoud Tahani
- Professor, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
| |
Collapse
|
11
|
Ideal plate screw configuration in femoral shaft fractures: 3D finite element analysis. JOURNAL OF SURGERY AND MEDICINE 2021. [DOI: 10.28982/josam.925624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
12
|
Mohandes Y, Tahani M, Rouhi G, Tahami M. A mechanobiological approach to find the optimal thickness for the locking compression plate: Finite element investigations. Proc Inst Mech Eng H 2021; 235:408-418. [PMID: 33427059 DOI: 10.1177/0954411920985757] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study aimed at finding the acceptable range, and the optimal value for the locking compression plate (LCP) thickness (THK), through simulating the osteogenic pathway of bone healing, and by checking bone-plate construct's strength and stability. To attain the goals of this research, a multi-objective approach was adopted, which should trade-off between some conflicting objectives. A finite element model of the long bone-plate construct was made first, and validated against an experimental study. The validated model was then employed to determine the initial strength and stability of the bone-plate construct, for the time right after surgery, for various thicknesses of the LCP. Afterward, coupling with a mechano-regulatory algorithm, the iterative process of bone healing was simulated, and follow up was made for each LCP thickness, over the first 16 post-operative weeks. Results of this study regarding the sequence of tissue evolution inside the fracture gap, showed a similar trend with the existing in-vivo data. For the material and structural properties assigned to the bone-plate construct, in this study, an optimal thickness for the LCP was found to be 4.7 mm, which provides an enduring fixation through secondary healing, whereas for an LCP with a smaller or greater thickness, either bone-implant failure, unstable fixation, impaired fracture consolidation, or primary healing may occur. This result is in agreement with a recent study, that has employed a comprehensive optimization approach to find the optimal thickness.
Collapse
Affiliation(s)
- Yousof Mohandes
- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Masoud Tahani
- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Gholamreza Rouhi
- Department of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Mohammad Tahami
- Bone and Joint Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| |
Collapse
|
13
|
Bone fracture healing under external fixator: Investigating impacts of several design parameters using Taguchi and ANOVA. Biocybern Biomed Eng 2020. [DOI: 10.1016/j.bbe.2020.09.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|