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首页> 外文期刊>Journal of orthopaedics and traumatology: official journal of the Italian Society of Orthopaedics and Traumatology >Biomechanical evaluation of six femurgraft-tibia complexes in ACL reconstruction
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Biomechanical evaluation of six femurgraft-tibia complexes in ACL reconstruction

机译：六种股骨-胫骨复合体在ACL重建中的生物力学评估

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摘要

Soft tissue graft-tibial tunnel fixation is considered the weak point in reconstruction of the anterior cruciate ligament (ACL). We hypothesized that the biomechanical properties of fixation devices used in ACL reconstruction can be better evaluated by testing complete constructs (femoral tunnel fixation-graft-tibial tunnel fixation). Porcine knees were reconstructed with bovine digital extensor tendons using 6 different commercially available fixation device combinations, and biomechanically tested with cyclic loads (1000 cycles, 0–150 N, 0.5 Hz) and until failure (crosshead speed, 250 mm/min). The device combinations tested (in groups of 6) were EndoButton CL-BioRCI, Swing Bridge-Evolgate, Rifidfix-Intrafix, Bone Mulch- Washerlock, Transfix-Retroscrew, and Transfix-Deltascrew. Ultimate failure load, stiffness, slippage at cycles 1, 100, 500 and 1000 and mode of failure were evaluated. The statistical differences between pairs of groups were assessed with Student’s unpaired t test. The ultimate failure load of complexes made with the Swing Bridge- Evolgate was significantly higher than any other device (968 N; p0.05), while that of devices made with Transfix-Retrofix was significantly lower than the others (483 N, p0.05). The stiffness of Swing Bridge-Evolgate complexes was significantly higher than the others (270 N/mm, p0.05). Regarding mode of failure, Rigidfix-Intrafix complexes showed a failure of the femoral fixation in all specimens. All failures of the other specimens occurred at the tibial side, except one specimen in the EndoButton CL-BioRCI group. Many commercially available tibial fixation devices showed biomechanically appreciable properties, sometimes better than femoral devices.
机译：软组织移植物-胫骨隧道固定被认为是重建前交叉韧带（ACL）的薄弱环节。我们假设通过测试完整的结构（股骨隧道固定-移植物-胫骨隧道固定）可以更好地评估用于ACL重建的固定装置的生物力学性能。使用6种不同的市售固定装置组合用牛指伸肌腱重建猪膝，并在循环载荷（1000个循环，0-150 N，0.5 Hz）直至失败（十字头速度，250 mm / min）下进行生物力学测试。测试的设备组合（以6组为一组）是EndoButton CL-BioRCI，摆动桥-进化门，Rifidfix-Intrafix，骨覆盖-Washerlock，Transfix-反向螺丝和Transfix-Delta螺丝。评估了第1、100、500和1000次循环的极限破坏载荷，刚度，滑移和破坏模式。使用学生的未配对t检验评估两组之间的统计学差异。使用Swing Bridge-Evolgate制造的复合物的最终破坏载荷显着高于任何其他设备（968 N; p <0.05），而使用Transfix-Retrofix制造的复合物的最终破坏载荷显着低于其他设备（483 N，p < 0.05）。 Swing Bridge-Evolgate配合物的刚度明显高于其他配合物（270 N / mm，p <0.05）。关于失败的方式，Rigidfix-Intrafix复合体在所有标本中均显示股骨固定失败。除EndoButton CL-BioRCI组中的一个标本外，其他所有标本的破坏均发生在胫骨侧。许多可商购的胫骨固定装置显示出生物力学上可观的特性，有时优于股骨器械。

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