Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, South Korea.
J Arthroplasty. 2012 Feb;27(2):323.e5-7. doi: 10.1016/j.arth.2011.03.017. Epub 2011 Apr 15.
The mobile meniscal bearing of unicompartmental knee arthroplasty is completely free moving, and dislocation of this bearing is a major concern for all mobile-bearing designs. Most dislocations are located in the intracapsular area; however, posterior dislocation of the polyethylene bearing to an extra-articular area of the knee after unicompartmental arthroplasty has not been previously reported. During a revision surgery, separate incision was necessary to remove a dislocated meniscal bearing in the popliteal fossa. The authors present a case of incarceration of a dislocated mobile bearing to the popliteal fossa after unicompartmental knee arthroplasty that was missed during initial diagnosis.
单间膝关节置换术中的活动半月板轴承是完全自由活动的，所有活动轴承设计的主要关注点是轴承脱位。大多数脱位位于关节囊内区域；然而，在单间膝关节置换术后，聚乙烯轴承向后脱位至膝关节关节外区域尚未有过报道。在翻修手术中，需要单独切口才能从腘窝中取出脱位的半月板轴承。作者报告了一例单间膝关节置换术后，活动轴承脱位至腘窝，初次诊断时漏诊。
