A Follow-up Study of Bipolar Hip Prosthesis for Osteoarthritis of the Hip. Assessment of Roentgenographic Changes in Acetabulum and Acetabular Bone Graft.:Assessment of Roentgenographic Changes in Acetabulum and Acetabular Bone Graft

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We performed bipolar hip arthroplasty combined with bone grafting acetabuloplasty on 26 hips since 1986 and reviewed them clinically and roentgenographically in this study.The average follow-up period was 4.5 years (range 3-6.3 years). Clinical results using JOA score were excellent in all cases with marked relief of pain; preoperative total average score of 52.7 points was improved to 85.8 points postoperatively. Outer head migration was frequently detected in cases which had insufficient post-operative coverage of the original acetabulum and a significant relationship was found between the post-operative CE angle by the original acetabulum and outer head migration (p<0.01), however, no relationship was found between post-operative CE angle involved with grafted bone and outer head migration. These results appeared to show that acetabular bone grafting did not prevent migration and outer head migration was stopped with the appearance of a sclerotic line in the acetabulum.These results suggest that special care should be paid to the operative indications of bipolar arthroplasty for osteoarthritis with acetabular dysplasia.
西日本整形・災害外科学会の論文

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