In vivo measurement of 3D load transfer mechanism in the lower extremity

为了研究小腿关节的三维载荷传递机制，采用三维关节模型和经校准的X射线系统拍摄的关节运动图像，在活体条件下评价了胫股关节和髌股关节的关节接触行为和髌腱的变形。随着膝关节屈曲角度的改变，接触区域的位置也会改变。膝关节屈曲至60°时，相对伸长率增大。超过60°后，肌腱外侧部分伸长率下降。作用于胫股关节和髌股关节的力的方向和幅度也随着膝关节情绪的不同而变化。

In order to investigate the 3-dimensional (3D) load transfer mechanism in thelower extremity, articular contact behavior at the tibiofemoral and patellofemoral joints and deformationof the patellar tendon were evaluated in vivo using 3D joint models and images of joint motion capturedby calibrated x-ray systems. As the flexion angle of the knee changed, the location of the contact areaalso altered. The relative elongation of the patellar tendon increased as the knee flexed up to 60°. Beyond 60°, the elongation in the lateral portion of the tendon decreased. The direction and theamplitude of the force applied across the tibiofemoral and patellofemoral joints also varied with the kneemotion.