Laboratory of Anatomy, Biomechanics and Organogenesis, Université Libre de Bruxelles (ULB), Bruxelles, Belgium.
Laboratory of Functional Anatomy, Université Libre de Bruxelles, Bruxelles, Belgium.
Surg Radiol Anat. 2021 Oct;43(10):1647-1657. doi: 10.1007/s00276-021-02738-1. Epub 2021 Mar 23.
Semitendinosus and gracilis muscles whose tendons are used in surgical reconstruction of the anterior cruciate ligament maintain their contractile ability, but the peak torque angle of hamstring muscles shifted to a shallow angle postoperatively. The goal was to quantify the influence of the myofascial structures on instantaneous moment arms of knee muscles to attempt explaining the above-mentioned post-surgical observations.
Hamstring harvesting procedures were performed by a senior orthopaedic surgeon on seven lower limbs from fresh-frozen specimens. Femoro-tibial kinematics and tendons excursion were simultaneously recorded at each step of the surgery.
No significant difference was demonstrated for instantaneous moment arm of gracilis during anterior cruciate ligament surgery (84% of the maximum intact values; P ≥ 0.05). The first significant semitendinosus moment arm decrease was observed after tendon harvesting (61% of the maximum intact values; p ≤ 0.005). After hamstring harvesting, the maximum and minimum moment arm (both gracilis and semi tendinosus) shifted to a shallow angle and 90°, respectively.
Moment arm modifications by paratenons and the loose connective tissue release are essential to understand the peak torque obtained to a shallow angle.
Basic science study, biomechanics.
用于前交叉韧带重建手术的半腱肌和股薄肌肌腱保持其收缩能力，但腘绳肌的峰值扭矩角度在手术后变为较浅的角度。目的是量化筋膜结构对膝关节肌肉瞬时力臂的影响，试图解释上述手术后观察结果。
由一名资深骨科医生在 7 个来自冷冻标本的下肢上进行腘绳肌采集手术。在手术的每一步都同时记录股骨-胫骨运动学和肌腱运动。
在前交叉韧带手术中，股薄肌的瞬时力臂没有显著差异（最大完整值的 84%；P≥0.05）。在肌腱采集后，半腱肌的第一个显著力臂下降（最大完整值的 61%；p≤0.005）。在腘绳肌采集后，最大和最小力臂（股薄肌和半腱肌）都转移到较浅的角度和 90°。
通过副韧带和疏松结缔组织松解来改变力臂对于理解在较浅角度获得的峰值扭矩至关重要。
基础科学研究，生物力学。
