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Szczesny SE, Corr DT. Tendon cell and tissue culture: Perspectives and recommendations. J Orthop Res 2023; 41:2093-2104. [PMID: 36794495 DOI: 10.1002/jor.25532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/19/2023] [Accepted: 02/08/2023] [Indexed: 02/17/2023]
Abstract
The wide variety of cell and tissue culture systems used to study and engineer tendons can make it difficult to choose the best approach and "optimal" culture conditions to test a given hypothesis. Therefore, a breakout session was organized at the 2022 ORS Tendon Section Meeting that focused on establishing a set of guidelines for conducting cell and tissue culture studies of tendon. This paper summarizes the outcomes of that discussion and presents recommendations for future studies. In the case of studying tendon cell behavior, cell and tissue culture systems are reductionist models in which the culture conditions should be strictly defined to approximate the in vivo condition as closely as possible. In contrast, for tissue engineering tendon replacements, the culture conditions do not need to replicate native tendon, but the outcome measures for success should be narrowly defined for the specific clinical application. Common recommendations for both applications are that researchers should perform a baseline phenotypic characterization of the cells that are ultimately used for experimentation. For models of tendon cell behavior, culture conditions should be well justified by existing literature and meticulously reported, tissue explant viability should be assessed, and comparisons to in vivo conditions should be made to determine baseline physiological relevance. For tissue engineering applications, the functional/structural/compositional outcome targets should be defined by the specific tendons they seek to replace, with key biologic and material properties prioritized for construct assessment. Lastly, when engineering tendon replacements, researchers should utilize clinically approved cGMP materials to facilitate clinical translation.
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Affiliation(s)
- Spencer E Szczesny
- Department of Biomedical Engineering, Pennsylvania State University, University Park, Pennsylvania, USA
- Department of Orthopaedics and Rehabilitation, Pennsylvania State University, Hershey, Pennsylvania, USA
| | - David T Corr
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA
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Frosch S, Buchhorn G, Hawellek T, Walde TA, Lehmann W, Hubert J. Comparison of the double loop knot stitch and Kessler stitch for Achilles tendon repair: A biomechanical cadaver study. PLoS One 2020; 15:e0243306. [PMID: 33270745 PMCID: PMC7714161 DOI: 10.1371/journal.pone.0243306] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 11/18/2020] [Indexed: 12/28/2022] Open
Abstract
Tendon elongation after Achilles tendon (AT) repair is associated with the clinical outcome. Reliable suture techniques are essential to reduce gap formations and to allow early mobilization. Cyclic loading conditions represent the repetitive loading in rehabilitation. The aim of this study was to compare the Kessler stitch and double loop knot stitch (DLKS) in a cyclic loading program focussing on gap formation. Sixteen human cadaveric ATs were transected and sutured using either the Kessler stitch or DLKS (eight matched pairs). The suture-tendon configurations were subjected to cyclic loading and additional ultimate load to failure testing using the Zwick 1446 universal testing machine. Each AT survived cyclic loading, with a mean gap formation less than 5 mm after 1000 cycles. The mechanical properties of the Kessler stitch and DLKS were not significantly different after cyclic loading with a mean displacement of 4.57 mm (± 1.16) for the Kessler stitch and 4.85 mm (± 1.14) for the DLKS (P = .76). There were no significant differences in the ultimate load testing (P = .85). Both bioprotective techniques prevent excessive gaping in cyclic testing when tendon loading is moderate. Our data and those from literature of gap formation in cyclic and ultimate loading allow the conclusion, that early aggressive AT loading after repair (e.g. full weightbearing) overstrain simple as well as complex suture configurations. Initial intraoperative tightening of the knots (preloading) before locking is important to decrease postoperative elongation.
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Affiliation(s)
- Stephan Frosch
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Göttingen, Germany
- * E-mail:
| | - Gottfried Buchhorn
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Göttingen, Germany
| | - Thelonius Hawellek
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Göttingen, Germany
| | - Tim Alexander Walde
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Göttingen, Germany
| | - Wolfgang Lehmann
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Göttingen, Germany
| | - Jan Hubert
- Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Ermutlu CŞ, Baran V. Comparison of Clinical, Biomechanical, and Histopathological Effects of Various Suture Techniques on Repair of Tendon Rupture by using Autograft. J Vet Res 2018; 61:231-237. [PMID: 29978078 PMCID: PMC5894399 DOI: 10.1515/jvetres-2017-0030] [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: 12/22/2016] [Accepted: 05/08/2017] [Indexed: 11/19/2022] Open
Abstract
Introduction The purpose of this study was to compare the effectiveness of four different suture techniques in the treatment of experimentally modelled tendon injuries with tissue loss with autograft and grafting applications in rabbits. Material and Methods The study was performed on 30 male mature (2-year-old) New Zealand rabbits with mean body weight of 3.1 kg, divided into three equal groups. A graft measuring 1 cm in length was collected from the m. tibialis cranialis of each rabbit under general anaesthesia. The graft collected from the right tendon was transplanted into the left tendon, and the graft from the left tendon was transplanted into the right tendon. In all groups, a simple interrupted suture was placed on the left tendon as control, a Bunnell-Mayer suture was placed on the right tendon in group I, a Locking-Loop suture in group II, and a Horizontal U suture in group III. Both hindlimbs were bandaged for four weeks. The tendons were assessed biomechanically and histopathologically. Results According to the results of the tensile testing, the maximum durability of the techniques ranked as follows: Bunnell-Mayer, Horizontal U, Locking-Loop, and control groups. Conclusion The use of autografts was a good alternative for the treatment of tendon ruptures with tissue loss. Furthermore, even though there were no clinical or histopathological differences, the suture technique can be chosen based on the results of the tensile test.
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Affiliation(s)
- Celal Şahin Ermutlu
- Department of Surgery, Faculty of Veterinary Medicine, Kafkas University, TR-36300, Kars, Turkey
| | - Vedat Baran
- Department of Surgery, Faculty of Veterinary Medicine, Kafkas University, TR-36300, Kars, Turkey
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Rees J, Gaida JE, Silbernagel KG, Zwerver J, Anthony JS, Scott A. Rehabilitation of Tendon Problems in Patients with Diabetes Mellitus. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 920:199-208. [PMID: 27535262 DOI: 10.1007/978-3-319-33943-6_19] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Exercise is crucial in the management of diabetes mellitus and its associated complications. However, individuals with diabetes have a heightened risk of musculoskeletal problems, including tendon pathologies. Diabetes has a significant impact on the function of tendons due to the accumulation of advanced glycation end-products in the load-bearing collagen. In addition, tendon vascularity and healing may be reduced due to diabetes-induced changes in the peripheral vascular system, and impaired synthesis of collagen and glycosaminoglycan. The current chapter presents an evidence-based discussion of considerations for the rehabilitation of tendon problems in people with diabetes. The following conditions are discussed in detail - calcific tendinopathy, tenosynovitis, tendon rupture, and non-calcifying tendinopathy. Common diabetes-related findings are presented, along with their potential impact on tendinopathy management and suggested modifications to standard tendinopathy treatment protocols. A holistic approach should be used to optimize musculotendinous function, including a comprehensive exercise prescription addressing strength, flexibility, and aerobic fitness.
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Affiliation(s)
- Jonathan Rees
- Department of Rheumatology, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, UK
- Academic Department of Sport and Exercise Medicine, Queen Mary College, London, UK
- Department of Sport and Exercise Medicine, Fortius Clinic, London, UK
| | - Jamie E Gaida
- University of Canberra Research Institute for Sport and Exercise (UCRISE), Discipline of Physiotherapy, University of Canberra, Canberra, ACT, Australia
| | | | - Johannes Zwerver
- Center for Sports Medicine, UMC Groningen, 30.001, 9700, RB Groningen, The Netherlands
| | - Joseph S Anthony
- Department of Physical Therapy, University of British Columbia, Vancouver, BC, Canada
| | - Alex Scott
- Department of Physical Therapy, Centre for Hip Health and Mobility, University of British Columbia, Vancouver, BC, Canada.
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Biomechanical comparison of three methods for distal Achilles tendon reconstruction. Knee Surg Sports Traumatol Arthrosc 2015; 23:3756-60. [PMID: 25026935 DOI: 10.1007/s00167-014-3176-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Accepted: 07/08/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE To compare the load at failure and stiffness associated with three surgical techniques for distal Achilles tendon reconstruction (AT). METHODS Nine matched pairs of fresh-frozen human cadaveric ATs were divided into three groups. Distal AT reconstruction was performed using suture anchors or one of two lengths of tendon overlap (10 or 5 mm). Each tendon was loaded to failure. The load at failure (N), stiffness (N/mm), and mode of failure were recorded. Differences in load at failure and stiffness were analysed. RESULTS Mean load at failure was significantly higher in the 10-mm group than in the 5-mm group (p < 0.05) or the suture-anchor group (p < 0.05). Load at failure did not differ significantly between the suture-anchor and 5-mm group, and stiffness did not differ significantly between any two groups. In the 10- and 5-mm groups, failure was caused by the grafts pulling out through the substance of the AT. Modes of failure varied in the suture-anchor group. CONCLUSIONS The load at failure was higher in the 10-mm group than in the 5-mm and suture-anchor groups. Although all three surgical techniques provide sufficient primary load-bearing ability, the 10-mm tendon-overlap technique may be more conducive to early post-operative rehabilitation.
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Abstract
STUDY DESIGN Controlled laboratory study. OBJECTIVES To measure Achilles tendon microcirculation (total hemoglobin [THb] and oxygen saturation [StO2]) before and after the application of a physical agent in asymptomatic participants, and to compare differences between application location and physical agent dosage. BACKGROUND Tendon microcirculation can be altered by superficial heating or cryotherapy. METHODS Fifty-one healthy adults (median age, 22 years; range, 20-34 years) were recruited and randomly assigned into 1 of 4 groups. Participants in each group received an intervention consisting of 1 of the following 4 physical agents: ultrasound (n = 12), interferential current (n = 14), low-level laser (n = 11), or vibration massage (n = 14). In each group, the selected intervention was applied at 2 different doses (ultrasound, 0.8 or 1.2 W/cm(2); laser, 5.4 or 18 J) or target locations (vibration and electrostimulation, calf muscle or Achilles tendon). For each participant, each dose or target location was randomly applied to 1 randomly selected lower leg (each leg receiving only 1 of the 2 options). RESULTS The StO2 values significantly increased after ultrasound at both doses (P<.008), and the THb value significantly increased for the higher dose only (P<.008). Both THb and StO2 values also significantly increased in response to vibration massage targeting the Achilles tendon (P<.008), and these values were greater than those resulting from the vibration massage applied to the calf muscle (P = .003 and .002, respectively). No significant THb and StO2 differences were found after the application of interferential current or low-level laser. CONCLUSION Tendon microcirculation increases after ultrasound and vibration massage intervention concentrated on the Achilles tendon. These modalities may be considered for the purpose of temporarily increasing microcirculation in the tendon.
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Cagnie B, Barbe T, De Ridder E, Van Oosterwijck J, Cools A, Danneels L. The influence of dry needling of the trapezius muscle on muscle blood flow and oxygenation. J Manipulative Physiol Ther 2013. [PMID: 23206963 DOI: 10.1016/j.jmpt.2012.10.005] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
OBJECTIVE The purpose of this study was to investigate the effect of dry needling on the blood flow and oxygen saturation of the trapezius muscle. METHODS Twenty healthy participants participated in this study. One single dry needling procedure was performed in the right upper trapezius, at a point located midway between the acromion edge and the seventh cervical vertebrae. Using the oxygen to see device, blood flow and oxygen saturation were evaluated at the treated point and 3 distant points (similar point in the left upper trapezius and 30 mm laterally from this midpoint). Measurements were taken at baseline and in the recovery period (0, 5, and 15 minutes posttreatment). RESULTS After removal of the needle, the blood flow and oxygen saturation increased significantly from the pretreatment level in the treated point (P ≤ .001), and these values remained high throughout the 15-minute recovery period. There were only minor changes in the distant points. CONCLUSIONS These results suggest that dry needling enhances the blood flow in the stimulated region of the trapezius muscle but not in a distant region used in this study.
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Affiliation(s)
- Barbara Cagnie
- Physical Therapist and Postdoctoral Researcher, Department of Rehabilitation Sciences and Physiotherapy, Ghent University, Ghent, Belgium.
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Scott Taylor M, Shalaby SW. Sutures. Biomater Sci 2013. [DOI: 10.1016/b978-0-08-087780-8.00087-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Longo UG, Forriol F, Campi S, Maffulli N, Denaro V. A biomechanical comparison of the primary stability of two minimally invasive techniques for repair of ruptured Achilles tendon. Knee Surg Sports Traumatol Arthrosc 2012; 20:1392-7. [PMID: 22228376 DOI: 10.1007/s00167-011-1868-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Accepted: 12/29/2011] [Indexed: 12/28/2022]
Abstract
PURPOSE To compare the primary stability of two minimally invasive procedures of Achilles tendon (AT) repair, namely a modified percutaneous repair of ruptured AT and the Achillon suture configuration. METHODS Eighteen (nine matched pairs) frozen ovine ATs were tenotomized 5 cm from the calcaneal insertion. In each pair, one tendon was randomly allocated to one of the two techniques: a modified percutaneous repair group and the Achillon device suture configuration. Specimens were tested performing an unidirectional tensile load to failure using a servo-hydraulic testing device (MTS Systems, Eden Prairie, MN, USA), controlled by an electropulse e3000 INSTRON machine (Instron Ltd, Buckinghamshire, UK). The tendons were then loaded to failure at a rate of 10 mm/s. RESULTS Two of the nine pairs of specimens were discarded because one specimen for each of the pair pulled out of the pneumatic clamp during mechanical testing. The remaining seven matched pairs were successfully tested. There were no differences in mean strength, mean maximum load, mean failure elongation, tension, stiffness and mode of failure between the two groups. CONCLUSION The Achillon-like configuration and the modified percutaneous repair of ruptured AT provided similar biomechanical performance.
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Affiliation(s)
- Umile Giuseppe Longo
- Department of Orthopaedic and Trauma Surgery, Campus Bio-Medico University, Via Alvaro del Portillo, 200, 00128, Rome, Italy
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Changes in microcirculation of the trapezius muscle during a prolonged computer task. Eur J Appl Physiol 2012; 112:3305-12. [DOI: 10.1007/s00421-012-2322-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Accepted: 01/09/2012] [Indexed: 10/14/2022]
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Konda SR, Gyftopolous S, Dayan A. Late intratendinous abscess of the Achilles tendon complicating surgical repair: a case report. Foot Ankle Int 2010; 31:1118-21. [PMID: 21189216 DOI: 10.3113/fai.2010.1118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Level of Evidence: V, Expert Opinion
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Affiliation(s)
- Sanjit R Konda
- NYU Hospital for Joint Diseases, Orthopaedic Surgery, 301 E 17th St, Suite 1402, New York, NY 10009, USA.
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Knobloch K, Joest B, Vogt PM. Cellulite and extracorporeal Shockwave therapy (CelluShock-2009)--a randomized trial. BMC WOMENS HEALTH 2010; 10:29. [PMID: 20977764 PMCID: PMC2987889 DOI: 10.1186/1472-6874-10-29] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Accepted: 10/26/2010] [Indexed: 11/10/2022]
Abstract
BACKGROUND Cellulite is a widespread problem involving females' buttocks and thighs based on the female specific anatomy. Given the higher number of fat cells stored in female fatty tissue in contrast to males, and the aging process of connective tissue leads to an imbalance between lipogenesis and lipolysis with subsequent large fat cells bulging the skin. In addition, microcirculatory changes have been suggested, however remain largely unknown in a controlled clinical setting. We hypothesize that the combination of extracorporeal shockwave and a daily gluteal muscle strength program is superior to the gluteal muscle strength program alone in cellulite. METHODS/DESIGN STUDY DESIGN Randomized-controlled trial. IRB approval was granted at Hannover Medical School, Germany on May 22, 2009. For allocation of participants, a 1:1 ratio randomization was performed using opaque envelopes for the concealment of allocation. Reporting: according to CONSORT 2010. Eligible patients were females aged 18 or over and 65 or younger with cellulite with documented cellulite 1°-4° according to the Nürnberger score. Exclusion criteria were suspected or evident pregnancy, no cellulite, no informed consent or age under 18 years or above 65 years. Patients were recruited by advertisements in local regional newspapers and via the Internet. ANALYSIS Intention-to-treat. OUTCOME PARAMETERS a) Photonumeric severity scale, b) Nürnberger Score, c) circumference measurements, d) capillary blood flow, e) tissue oxygen saturation, f) postcapillary venous blood flow. Intervention group: Six sessions of extracorporeal focused shock wave for six sessions (2000 impulses, 0,25 mJ/m2 every 1-2 weeks) at both gluteal and thigh regions plus a specific gluteal strength exercise training. CONTROL GROUP Six sessions of sham extracorporeal focused shock wave for six sessions (2000 impulses, 0,01 mJ/m2 every 1-2 weeks) at both gluteal and thigh regions plus a specific gluteal strength exercise training. FOLLOW-UP 12 weeks. Blinding was achieved for all participants enrolled in the trial, the photograph taking the digital images for the primary outcome measure, the two assessors of the outcome measures, all additional health care providers and for the analyst from the biometrical department. Only one researcher (BJ) was aware of the group assignment performing the randomisation and the extracorporeal shock wave therapy. DISCUSSION This randomised-controlled trial will provide much needed evidence on the clinical effectiveness of focused extracorporal shock wave therapy as an adjunct to gluteal strength training in females suffering cellulite.
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Affiliation(s)
- Karsten Knobloch
- Plastic, Hand and Reconstructive Surgery, Hannover Medical School, Germany.
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