Orthopedics and Trauma Department of Hospital de S. Francisco Xavier, Centro Hospitalar de Lisboa Ocidental Estrada Forte do Alto do Duque, 1449-005, Lisbon, Portugal.
Hospital Cuf Infante Santo, Travessa do Castro, 3, 1350-000, Lisbon, Portugal.
Sci Rep. 2018 Aug 27;8(1):12835. doi: 10.1038/s41598-018-30931-7.
The purpose of this study was to evaluate the biomechanical properties of a graft construct with quadrupled Semitendinosus and two cortical buttons with adjustable loops concerning elongation, stiffness and resistance. A total of 15 fresh human cadaveric semitendinosus tendons were quadrupled over the two adjustable loops and stitched at the tibial tip with a cerclage type suture. They underwent pre-tensioning at 300 N for 2 minutes followed by cyclic loading (1000 cycles between 50-250 N) and finally a load-to-failure test. Statistical analysis was performed using SPSS Statistics software and groups were compared using a paired t-test, with a significance level set at α = 0.05. Graft construct elongation after pre-tensioning at 300 N was 12.8 mm (9.3 mm-16.5 mm) and mean cyclic elongation 0.4 mm (0.2 mm-0.9 mm), considered significant (p < 0,001). The resistance and stiffness values were respectively 849.46 N (649.30 N-1027.90 N) and 221.49 N (178,30 N - 276.10 N). Quadruple ST graft construct using two cortical buttons and adjustable loops showed a high stiffness and resistance with a very low elongation after cycling.
本研究旨在评估一种四股半腱肌和两个带有可调节环的皮质骨纽扣的移植物结构的生物力学性能，涉及伸长率、刚度和阻力。总共 15 个新鲜的人半腱肌腱在两个可调节环上被四倍化，并在胫骨尖端用环形缝线缝合。它们在 300N 下预张紧 2 分钟，然后进行循环加载（50-250N 之间的 1000 个循环），最后进行失效负载测试。使用 SPSS Statistics 软件进行统计分析，使用配对 t 检验比较组，显著性水平设为 α=0.05。在 300N 下预张紧后移植物结构的伸长率为 12.8mm（9.3mm-16.5mm），平均循环伸长率为 0.4mm（0.2mm-0.9mm），差异具有统计学意义（p<0.001）。阻力和刚度值分别为 849.46N（649.30N-1027.90N）和 221.49N（178.30N-276.10N）。使用两个皮质骨纽扣和可调节环的四股半腱肌移植物结构具有高刚度和阻力，在循环后伸长率非常低。
