中文摘要：

当人的身体的四头肌肌肉对膝关节的每日的活动相当重要时，自从它不能在 vivo 被测量，四头肌力量的决心提出重要挑战。这里，一条新奇途径被介绍获得力量在通过运动摄影，测量的力量变换器， multi-rigid-body 理论和有限元素分析的联合蹲。第一，人为的几何、尖的数据蹲进程为人通过拍摄图画的分析被获得与照相机蹲。同时，力量变换器被用来从脚测量反应力量并且决定重心为相同蹲过程。基于 multi-rigid-body 动力学，下次，为人权腿和脚的一个数学模型被建立以便决定四头肌转矩在下面不同蹲角度。然后，强迫以便决定四头肌与一起变化蹲角度，一个简化三维的有限元素模型被造包括胫骨，腓骨，髌，髌系带和四头肌腱。最后，膝关节的接触压力与从有限元素分析包含获得的四头肌力量的膝关节的确定的模型一起为 squat 被分析。并且它证明在 090 度蹲进程，关节的软骨和 menisci 的接触压力的山峰值被增加与增加蹲角度。这研究能为膝的 biomechanical 行为的进一步的理解被引用，接触压力在膝上每天完成活动，并且为运动康复是显著地有启发性的。

英文摘要：

While the quadriceps muscles of human body are quite important to the daily ac-tivities of knee joints,the determination of quadriceps forces poses significant challenges since it cannot be measured in vivo.Here,a novel approach is presented to obtain the forces in squat through the combination of motion photography,force transducers measuring,multi-rigid-body theory and finite element analysis.Firstly,the geometrical and angular data of human for squat process were obtained through the analysis of photographed pictures for human squat with cam-era.At the same time,force transducers were used to measure the reaction forces from feet and to determine the center of gravity for identical squat process.Next,based on the multi-rigid-body dynamics,a mathematical model for human right leg and foot was established in order to determine the quadriceps torques under different squat angles.Then,so as to determine the quadriceps forces along with varied squat angles,a simplified three-dimensional finite element model was built,including tibia,fibula,patella,patella ligament and quadriceps tendon.Finally,the contact pressure of knee joint was analyzed for the squat with the established model of knee joint involving the obtained quadriceps forces from finite element analysis.And it showed that in the 0-90 degree squat process,the peak value of contact pressure of articular cartilages and menisci is increased with the increased squat angle.This study can be referenced for further un-derstanding of the biomechanical behaviors of knee,contact pressure effects of daily activities on knee,and is significantly instructive for sports rehabilitation.