Heidelberg University Hospital, Department of Orthopedics and Traumatology, Schlierbacher Landstraße 200a, Heidelberg, 69118, Germany.
Clinic for Orthopedics and Trauma Surgery, Laboratory of Biomechanics and Implant Research, Schlierbacher Landstraße 200a, Heidelberg, 69118, Germany.
Bone Joint J. 2014 Jul;96-B(7):896-901. doi: 10.1302/0301-620X.96B7.33478.
Aseptic loosening of the femoral component is an important indication for revision surgery in unicompartmental knee replacement (UKR). A new design of femoral component with an additional peg was introduced for the cemented Oxford UKR to increase its stability. The purpose of this study was to compare the primary stability of the two designs of component. Medial Oxford UKR was performed in 12 pairs of human cadaver knees. In each pair, one knee received the single peg and one received the twin peg design. Three dimensional micromotion and subsidence of the component in relation to the bone was measured under cyclical loading at flexion of 40° and 70° using an optical measuring system. Wilcoxon matched pairs signed-rank test was performed to detect differences between the two groups. There was no significant difference in the relative micromotion (p = 0.791 and 0.380, respectively) and subsidence (p = 0.301 and 0.176, respectively) of the component between the two groups at both angles of flexion. Both designs of component offered good strength of fixation in this cadaver study.
股骨部件的无菌性松动是单髁膝关节置换术（UKR）翻修手术的重要指征。为了增加其稳定性，一种带有附加销钉的新型股骨部件设计被引入到骨水泥固定的牛津 UKR 中。本研究旨在比较两种部件设计的初始稳定性。对 12 对人体尸体膝关节进行内侧牛津 UKR。在每对膝关节中，一只膝关节接受单销钉设计，另一只接受双销钉设计。使用光学测量系统，在膝关节屈曲 40°和 70°时进行循环加载，测量组件相对于骨骼的三维微动和下沉。采用 Wilcoxon 配对符号秩检验来检测两组之间的差异。在两个弯曲角度下，组件的相对微动（p = 0.791 和 0.380）和下沉（p = 0.301 和 0.176）在两组之间均无显著差异。在这项尸体研究中，两种组件设计均提供了良好的固定强度。
