Abstract
Purpose
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.
Methods
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.
Results
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.
Conclusion
Moment arm modifications by paratenons and the loose connective tissue release are essential to understand the peak torque obtained to a shallow angle.
Level of evidence: Basic science study, biomechanics.
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The authors are grateful to Mr. J-L Sterckx, for his technical support.
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OS, BB, PS, MR, and VF contributed to the study conception and design. Material preparation, data collection, and analysis were performed by OS, BB, PS, JC, and HB. The first draft of the manuscript was written by OS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Snoeck, O., Beyer, B., Rooze, M. et al. Gracilis and semitendinosus moment arm decreased by fascial tissue release after hamstring harvesting surgery: a key parameter to understand the peak torque obtained to a shallow angle of the knee. Surg Radiol Anat 43, 1647–1657 (2021). https://doi.org/10.1007/s00276-021-02738-1
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DOI: https://doi.org/10.1007/s00276-021-02738-1