• Yu Mori, Naoko Mori, Taketo Mori, Satoshi Nakamura, Masato Ishizuka, Tokuhisa Sano, and Eiji Itoi.
• Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo machi, Aobaku, Sendai, Miyagi, 980-8574, Japan, yu-mori@med.tohoku.ac.jp.
• Eur J Orthop Surg Tr. 2014 Aug 1; 24 (6): 905-9.

ObjectivesThe aim of this study was to analyze the radiological outcomes of bipolar hemiarthroplasty after displaced femoral neck fractures of non-arthritic hip joints in rheumatoid arthritis patients.MethodsWe retrospectively investigated 25 hip joints in 23 rheumatoid arthritis patients who underwent bipolar hemiarthroplasty for displaced femoral neck fracture of non-arthritic hip joints. All patients were female with an average age of 69.8 years (range 51-83 years). Mean follow-up duration was 8.4 years (range 5-12 years). Radiographs taken immediately, 1 year after surgery and most recently, were collected for each case. Radiographic measurement of the migration distance of the outer-head prosthesis in the direction of vertical, horizontal and medial to Köhler's line was undertaken at 1 year after surgery and most recently.ResultsNo patients had hip-related pain after surgery. No case indicated apparent central migration and >3-mm migration of the hemisphere in each direction. There was no significant change in migration distance between evaluation at 1 year after surgery and most recently.ConclusionsWe conclude that risk of acetabular protrusion appears to be low in patients of rheumatoid arthritis treated with bipolar hemiarthroplasty for displaced femoral neck fractures of non-arthritic hip joints in the medium term.

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