正常活动中，胫股几何形状与肌肉骨骼功能之间的关系。
The relationship between tibiofemoral geometry and musculoskeletal function during normal activity.
机构信息
Medical Device Research Institute, College of Science and Engineering, Flinders University, Bedford Park, Australia; School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, Australia.
Department of Industrial Engineering, University of Bologna, Bologna, Italy.
出版信息
Gait Posture. 2020 Jul;80:374-382. doi: 10.1016/j.gaitpost.2020.06.022. Epub 2020 Jun 26.
BACKGROUND
The effect of tibiofemoral geometry on musculoskeletal function is important to movement biomechanics.
RESEARCH QUESTION
We hypothesised that tibiofemoral geometry determines tibiofemoral motion and musculoskeletal function. We then aimed at 1) modelling tibiofemoral motion during normal activity as a function of tibiofemoral geometry in healthy adults; and 2) quantifying the effect of tibiofemoral geometry on musculoskeletal function.
METHODS
We used motion data for six activity types and CT images of the knee from 12 healthy adults. Geometrical variation of the tibia and femoral articular surfaces were measured in the CT images. The geometry-based tibiofemoral motion was calculated by fitting a parallel mechanism to geometrical variation in the cohort. Matched musculoskeletal models embedding the geometry-based tibiofemoral joint motion and a common generic tibiofemoral motion of reference were generated and used to calculate joint angles, net joint moments, muscle and joint forces for the six activities analysed. The tibiofemoral model was validated against bi-planar fluoroscopy measurements for walking for all the six planes of motion. The effect of tibiofemoral geometry on musculoskeletal function was the difference between the geometry-based model and the model of reference.
RESULTS
The geometry-based tibiofemoral motion described the pattern and the variation during walking for all six motion components, except the pattern of anterior tibial translation. Tibiofemoral geometry had moderate effect on cohort-averages of musculoskeletal function (R = 0.60-1), although its effect was high in specific instances of the model, outputs and activities analysed, reaching 2.94 BW for the ankle reaction force during stair descent. In conclusion, tibiofemoral geometry is a major determinant of tibiofemoral motion during walking.
SIGNIFICANCE
Geometrical variations of the tibiofemoral joint are important for studying musculoskeletal function during normal activity in specific individuals but not for studying cohort averages of musculoskeletal function. This finding expands current knowledge of movement biomechanics.
背景
胫骨股骨几何形状对肌肉骨骼功能的影响对运动生物力学很重要。
研究问题
我们假设胫骨股骨几何形状决定胫骨股骨运动和肌肉骨骼功能。然后，我们的目标是 1）将正常活动期间的胫骨股骨运动建模为健康成年人胫骨股骨几何形状的函数；2）量化胫骨股骨几何形状对肌肉骨骼功能的影响。
方法
我们使用了六种活动类型的运动数据和 12 名健康成年人的膝关节 CT 图像。在 CT 图像中测量了胫骨和股骨关节面的几何变化。通过将平行机构拟合到队列中的几何变化，计算出基于几何形状的胫骨股骨运动。生成了嵌入基于几何形状的胫骨股骨关节运动和通用胫骨股骨关节运动的参考通用胫骨股骨模型，并用于计算六个分析活动的关节角度、净关节力矩、肌肉和关节力。使用双平面荧光透视测量来验证胫骨模型在行走时的六个运动平面。胫骨股骨几何形状对肌肉骨骼功能的影响是基于几何形状的模型和参考模型之间的差异。
结果
基于几何形状的胫骨股骨运动描述了除前胫骨平移模式外，所有六个运动成分在行走时的模式和变化。胫骨股骨几何形状对肌肉骨骼功能的群体平均值有中等影响（R=0.60-1），尽管在模型的特定实例、输出和分析的活动中，其影响很高，达到 2.94 BW 用于楼梯下降时的踝关节反作用力。总之，胫骨股骨几何形状是行走时胫骨股骨运动的主要决定因素。
意义
胫骨股骨关节的几何变化对于研究特定个体正常活动期间的肌肉骨骼功能很重要，但对于研究肌肉骨骼功能的群体平均值则不重要。这一发现扩展了运动生物力学的现有知识。
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