Mizrahi J, Susak Z, Bahar A, Seliktar R, Najenson T
Scand J Rehabil Med Suppl. 1985;12:117-23.
The purpose of this study was to determine the relation between geometry of the patellar tendon (PT) insertion in the socket and the dynamic load transmitted through the PT, in a patellar tendon bearing (PTB) prosthesis. The dynamic load was measured by a specially constructed two-component load cell, which was mounted on the experimental prosthesis. Geometry of the PT insertion relative to the socket was altered by adjusting the location of the mounting frame-load cell assembly. Evaluation of performance of the prosthesis in the range of geometries investigated was made objectively by gait analysis of the patients. The latter was performed on a 10 m walkpath, including at halfway two forceplates, from which the foot-ground forces were recorded. Simultaneously, the PT forces on the prosthesis, as sensed by the load cell were monitored. Computer processing of the data included full analysis of the force-trace and the determination of criteria for optimization of the PT insertion. The resulting criteria were those which expressed minimization of abnormalities in the foot-ground forces of each patient, such as vertical and braking forces and their timings. The complete optimization procedure, which was undertaken for two below-knee male amputees, indicated the correct positioning of the PT insertion, actually taken in the final fitting procedure of the socket of the prosthesis.
本研究的目的是确定在髌腱承重（PTB）假体中，髌腱（PT）在接受腔中的插入几何形状与通过PT传递的动态载荷之间的关系。动态载荷由安装在实验性假体上的特制双分量测力传感器测量。通过调整安装框架-测力传感器组件的位置来改变PT相对于接受腔的插入几何形状。通过对患者进行步态分析，客观评估在所研究的几何形状范围内假体的性能。步态分析在一条10米的步行道上进行，步行道中途包括两个测力板，用于记录足底与地面的作用力。同时，监测测力传感器所感知的假体上的PT力。数据的计算机处理包括对力迹线的全面分析以及确定优化PT插入的标准。所得标准是那些能使每位患者足底与地面作用力的异常情况（如垂直力、制动力及其时间）最小化的标准。针对两名膝下男性截肢者进行的完整优化程序，表明了PT插入的正确位置，这实际上是在假体接受腔的最终适配过程中确定的。
