Viscoelastic and failure properties of two configurations of triple-folded hamstring tendons used for anterior cruciate ligament (ACL) reconstruction
| Autor: | Jeffrey Orr, Andrew Sephien, Miguel A. Diaz, T. Kyle Stoops, Charles Nofsinger, Brian Hamzavi |
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| Rok vydání: | 2020 |
| Předmět: |
Adult
Male Anterior cruciate ligament Hamstring Muscles Transplantation Autologous Viscoelasticity 03 medical and health sciences 0302 clinical medicine medicine Stress relaxation Cadaver Humans Orthopedics and Sports Medicine Displacement (orthopedic surgery) Anterior Cruciate Ligament Autografts 030222 orthopedics Anterior Cruciate Ligament Reconstruction Sutures business.industry Viscosity Hamstring Tendons 030229 sport sciences Middle Aged Biomechanical Phenomena medicine.anatomical_structure Creep Female Cadaveric spasm business Hamstring Biomedical engineering |
| Zdroj: | The Knee. 29 |
| ISSN: | 1873-5800 |
| Popis: | Background Hamstring autografts are commonly used for anterior cruciate ligament (ACL) reconstruction. Different folding techniques exist in tripling the semitendinosus. Few anatomical studies exist in evaluating their viscoelastic properties. The purpose of this study was to characterize and compare the viscoelastic and failure properties of two hamstring graft configurations, the “Z” construct and “2” construct. Methods Ten matched pairs of fresh-frozen cadaveric semitendinosus hamstring grafts were used to create the “2” configuration or “Z” configuration. The biomechanical testing consisted of four phases: preconditioning, where graft dimensions (mm) were measured; stress relaxation, where load, displacement and time data were collected and equilibrium relaxation (%) was calculated; dynamic creep, where the total construct elongation was calculated; and ramp-to-failure, where maximum failure load was recorded. Results The “2” configuration demonstrated recorded forces (N) significantly greater at each time point when compared to the “Z” configuration during stress relaxation (p = 0.003). The “2” configuration exhibited significantly less construct elongation (mm) during dynamic creep at 10 cycles (p = 0.008) and 2000 cycles (p = 0.0001). The maximum measured load at failure was significantly greater in the “2” configuration constructs than “Z” configuration (p = 0.013). Moreover, the axial loads at 2, 3 and 4 mm of displacement were, on average, greater in the “2” configuration than “Z” configuration (p = 0.152; p = 0.080; p = 0.012), respectively. Conclusion The results of this study provide support for folding techniques for tripled grafts to provide higher viscoelastic and failure properties for techniques with less suture interfaces. Future studies can potentially evaluate the clinical significance of these findings. |
| Databáze: | OpenAIRE |
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