Ma S M, Kabo J M, Amstutz H C
J Bone Joint Surg Am. 1983 Mar;65(3):366-70.
The frictional torque of the Trapezoidal-28 total hip replacement and the Tharies SR-3 and SR-5 surface replacements were measured in the University of California at Los Angeles hip-joint simulator in calf serum. Loads of as much as 890 newtons were applied while the femoral component oscillated through a 60-degree arc at forty cycles per minute. Frictional torque, as measured by a ring transducer at a fixed distance from the center of rotation, was seen to diminish as the thickness of the polyethylene increased and was found to be relatively proportional to the diameter of the femoral component. The torques measured in this study were found to be twenty to 100 times smaller than the static torques to failure for acetabular fixation that have been reported in the literature. Finally, no permanent deformation of the thin acetabular shells attributable to the cementing process was apparent when the recommended technique of surgical insertion was utilized.
Surface replacement components have been shown to generate greater frictional torques at the acetabular bone-cement interface than do smaller-diameter conventional hip replacements. This indicates that the local mechanical-loading conditions of the hip joint are not the same for both types of replacements, and this should be considered when selecting the type of arthroplasty for an individual patient.
在加利福尼亚大学洛杉矶分校髋关节模拟器中，于小牛血清中测量了梯形-28全髋关节置换以及塔里耶斯SR - 3和SR - 5表面置换的摩擦扭矩。当股骨部件以每分钟40次的频率在60度弧内摆动时，施加高达890牛顿的负荷。通过距旋转中心固定距离处的环形传感器测量的摩擦扭矩，随着聚乙烯厚度的增加而减小，并且发现其与股骨部件的直径相对成比例。本研究中测量的扭矩比文献中报道的髋臼固定静态破坏扭矩小20至100倍。最后，当采用推荐的手术植入技术时，未观察到因骨水泥固定过程导致的薄髋臼壳永久变形。
与小直径传统髋关节置换相比，表面置换部件在髋臼骨水泥界面产生更大的摩擦扭矩。这表明两种类型的置换髋关节局部机械加载条件不同，在为个体患者选择关节成形术类型时应考虑这一点。
