Long-term Results of Charnley Total Hip Replacement(THR) with More than 15 Years Follow-up.

概要

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Fifty hips in 40 patients with Charnley THR of more than 15 years follow-up were examined in terms of walking ability and survival against revision at the average follow-up period of 18.1 years. Patients consisted of 8 males and 32 females with underlying disease comprising 43 cases of osteoarthritis and 7 avascular necrosis. Twenty six with original THR were further evaluated both clinically by JOA hip score and radiologically on findings such as clear zone, socket migration, stem sinking and cortical thickening at the stem-tip. Fifteen of the 40 patients could walk without any help, however, another 15 used a cane and the other 10 were unable to walk either using a wheel chair or remaining in bed. Revision surgery had been done in 12 hips (24%), seven of which were needed because of prosthesis loosening. Survival until revision at 5, 10 and 15 years after the primary operation was 96%, 94% and 86% respectively in our series. The result of JOA hip score of the 26 with original THR ranged from 16 to 96 points with an average of 66 points. A radiological clear zone of more than 1mm was observed in 23 hips (88.5%), socket migration in 6 hips (23.1%), stem sinking of more than 2mm in 2 hips (7.7%) and cortical thickening at the stem-tip in 10 hips (38.7%). There was no significant radiological findings correlating to the clinical result of JOA hip scores.
西日本整形・災害外科学会の論文