Eiskjaer S, Gelineck J, Søballe K
Department of Orthopedic Surgery, Arhus Kommunehospital, University of Arhus, Denmark.
Orthopedics. 1989 Dec;12(12):1545-50. doi: 10.3928/0147-7447-19891201-06.
Seven of 59 (12%) bipolar hemiarthroplasties for displaced femoral neck fracture were classified as failures at the 3-year follow-up examination. Two prostheses dislocated, 4 had loose femoral stems, and 1 was revised to a total hip arthroplasty because of pain. No patients developed acetabular erosion or deep infection. Only four of 15 patients examined by fluoroscopy shared movement between outer metal/cartilage and inner metal/polyethylene surfaces. All movement occurred at the outer metal/cartilage surface in the remaining nine patients. We conclude that the low failure rate, which compares favorably with the best results after internal fixation, is caused by the optimal selection of patients for this operation (high age, low activity level) and the use of bone cement. The bipolar design is less important, since most of these prostheses function as ordinary unipolar prostheses after some time.
在59例因股骨颈移位骨折而进行的双极半髋关节置换术中，7例（12%）在3年随访检查时被归类为失败病例。2个假体发生脱位，4个股骨柄松动，1例因疼痛而翻修为全髋关节置换术。没有患者出现髋臼侵蚀或深部感染。在接受透视检查的15例患者中，只有4例在金属/软骨外层与金属/聚乙烯内层表面之间存在活动。其余9例患者的所有活动均发生在金属/软骨外层表面。我们得出结论，与内固定术后的最佳结果相比，该手术失败率较低，这是由于对该手术患者的最佳选择（高龄、低活动水平）以及骨水泥的使用所致。双极设计的重要性较低，因为这些假体中的大多数在一段时间后会像普通单极假体一样发挥功能。
