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首页> 外文期刊>Journal of Biomechanics >The effective quadriceps and patellar tendon moment arms relative to the tibiofemoral finite helical axis
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The effective quadriceps and patellar tendon moment arms relative to the tibiofemoral finite helical axis

机译：相对于胫股有限螺旋轴的有效股四头肌和pa腱力矩臂

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The moment arm is a crucial parameter for understanding musculoskeletal dynamics as it defines how linear muscle force is transformed into a moment. Yet, for the quadriceps tendon this parameter cannot be directly calculated, as the patella creates a dynamic fulcrum. Thus, the effective quadriceps moment arm (EQma) was developed to define the quadriceps force to tibial moment relationship. In vivo data in regards to the EQma are lacking and the critical question of how patellofemoral kinematics may influence the EQma remains unresolved. Therefore, the purpose of this study was to quantify the in vivo EQma during a knee extension exercise in asymptomatic controls and to correlate the EQma with sagittal plane patellofemoral kinematics. While subjects (30F/10M, 26.5 +/- 5.6 years, 167.5 +/- 10.2 cm, 62.6 +/- 10.7 kg) cyclically flexed-extended their knees within the MR scanner, dynamic cine-phase contrast and cine MR images were acquired. From these data, patellofemoral kinematics, the ratio of the patellar tendon to quadriceps force, the patellar tendon moment arm, and the EQma were quantified. The EQma trended upwards (32.9-45.5 mm (females) and 31.5-47.1 mm (males)) as the knee angle decreased (50-10 degrees). The quadriceps had a mechanical advantage (ratio of patellar to quadriceps tendon forces >1.0) for knee angles <= 20 degrees. The EQma did not correlate with sagittal plane patellofemoral kinematics. As this is the first study to characterize the EQma in vivo during dynamic volitional activity, in a large group of asymptomatic controls, it can serve as a foundation for future knee joint models and to explore how pathological conditions affect the EQma. Published by Elsevier Ltd.
机译：弯矩臂是了解肌肉骨骼动力学的关键参数，因为它定义了线性肌肉力如何转换为弯矩。然而，由于the骨产生了动态支点，因此对于四头肌腱该参数无法直接计算。因此，开发了有效的股四头肌力矩臂（EQma）来定义股四头肌力与胫骨力矩的关系。缺乏有关EQma的体内数据，关于pa股运动学如何影响EQma的关键问题仍未解决。因此，本研究的目的是量化无症状对照的膝关节伸展运动中的体内EQma，并将EQma与矢状面pa股运动学相关联。当受试者（30F / 10M，26.5 +/- 5.6岁，167.5 +/- 10.2 cm，62.6 +/- 10.7 kg）在MR扫描仪中循环屈伸膝盖时，获得了动态电影相位对比和电影MR图像。从这些数据中，pa股运动学、,肌腱与股四头肌力的比率，the肌腱力矩臂和EQma得以量化。随着膝盖角度的减小（50-10度），EQma呈上升趋势（女性为32.9-45.5 mm，男性为31.5-47.1 mm）。膝关节角小于等于20度时，股四头肌具有机械优势（of骨与股四头肌腱力之比> 1.0）。 EQma与矢状面pa股运动学无关。由于这是第一项在动态自愿活动过程中表征体内EQma的研究，因此在大量无症状对照中，它可以作为未来膝关节模型的基础，并探讨病理状况如何影响EQma。由Elsevier Ltd.发布

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