Gebhard J S, Kilgus D J
University of California, Los Angeles 90024.
Clin Orthop Relat Res. 1990 May(254):225-9.
Posterior stabilized knee prostheses have been recommended for knees with posterior cruciate deficiency, as well as for knees with prior patellectomy. Two cases are presented in which a complete dislocation of a Kinematic II Stabilizer prosthesis occurred after primary knee arthroplasty. The mechanism of dislocation was a varus or valgus stress while the knee was flexed. This previously unreported complication of dislocation after primary knee arthroplasty with a posterior stabilized knee prosthesis was, we believe, due, in part, to the design of this prosthesis, which provides little mediolateral stability in flexion, in combination with a mild degree of laxity of the collateral ligaments. This complication could be prevented by use of a prosthesis with greater inherent mediolateral stability.
后稳定型膝关节假体已被推荐用于后交叉韧带缺失的膝关节，以及先前接受过髌骨切除术的膝关节。本文介绍了两例病例，在初次膝关节置换术后，Kinematic II稳定型假体发生了完全脱位。脱位机制是膝关节屈曲时的内翻或外翻应力。我们认为，初次膝关节置换术后使用后稳定型膝关节假体出现这种先前未报道的脱位并发症，部分原因在于该假体的设计，其在屈曲时提供的内外侧稳定性较小，再加上侧副韧带轻度松弛。使用具有更大固有内外侧稳定性的假体可以预防这种并发症。
