Shi Kenrin, Hayashida Kenji, Umeda Naoya, Yamamoto Kengo, Kawai Hideo
Department of Orthopaedic Surgery, Osaka Rosai Hospital, Osaka, Japan.
J Arthroplasty. 2008 Feb;23(2):164-9. doi: 10.1016/j.arth.2007.01.009. Epub 2007 Sep 24.
Femoral component rollback and tibial rotation were evaluated using lateral radiographs taken during passive knee flexion under fluoroscopy in NexGen Legacy Posterior Stabilized Flex (Zimmer, Warsaw, Ind) total knee arthroplasties (TKAs; 30 with mobile insert and 26 with fixed insert). Measured maximal flexion angle demonstrated no significant differences. Femoral component rollback was observed predominantly in TKAs with fixed insert in more than 45 degrees flexion and correlated with maximal flexion angle in each group. Tibial internal rotation was more significant in TKAs with mobile insert in maximal flexion. However, tibial internal rotation from 90 degrees to maximal flexion, which demonstrated correlation with maximal flexion angle in each group, did not show significant difference. The kinematic differences between 2 inserts seemed to have little relevance to the maximal flexion angle.
在NexGen Legacy后稳定型Flex（捷迈公司，印第安纳州华沙）全膝关节置换术（TKAs；30例使用活动衬垫，26例使用固定衬垫）中，通过在透视引导下被动屈膝时拍摄的侧位X线片评估股骨部件后滚和胫骨旋转情况。测量的最大屈曲角度无显著差异。在屈曲超过45度时，股骨部件后滚主要见于使用固定衬垫的TKA中，且与每组的最大屈曲角度相关。在最大屈曲时，使用活动衬垫的TKA中胫骨内旋更明显。然而，从90度到最大屈曲时的胫骨内旋，虽与每组的最大屈曲角度相关，但无显著差异。两种衬垫之间的运动学差异似乎与最大屈曲角度关系不大。
