Yan Chun Hoi, Chiu Kwong Yuen, Ng Fu Yuen
Department of Orthopaedics and Traumatology, The University of Hong Kong, Queen Mary Hospital,Hong Kong SAR, China.
J Orthop Surg (Hong Kong). 2010 Dec;18(3):385-8. doi: 10.1177/230949901001800328.
Anterior dislocation of a posterior stabilised total knee arthroplasty secondary to a polyethylene tibial post fracture is rare. We report one such case in an 89-year-old Chinese woman who had undergone total knee arthroplasty using the Insall Burstein II prosthesis 7 years earlier. The failure was due to sagittal malalignment of the components. Owing to more pronounced anterior bowing of the distal femoral shaft in southern Chinese, neutral component placement is often biased toward hyperextension. When the knee reaches full extension, anterior impingement occurs. Surgeons must therefore take extra care in preoperative planning and bone cutting in this population.
后稳定型全膝关节置换术后因聚乙烯胫骨柱骨折继发前脱位的情况较为罕见。我们报告了一例这样的病例，患者为一名89岁的中国女性，7年前接受了使用Insall Burstein II假体的全膝关节置换术。失败原因是假体矢状面排列不齐。由于中国南方人群股骨干远端前弓更明显，假体中立位放置常偏向于过伸。当膝关节达到完全伸直时，就会发生前方撞击。因此，外科医生在该人群的术前规划和截骨操作中必须格外小心。
