Endoprosthesis for Avascular Necrosis of the Femoral Head. A Follow-up Study of More than Five Years Post-Operatively.:A Follow-up Study of More than Five Years Post-Operatively

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We investigated the clinical results and prognosis following use of endoprosthesis for treatment of necrosis of the femoral head over five years. 25 hips of 17 patients were examined. Twelve patients were male and five patients were female. The mean follow-up period was 7.4 years (range: 5-11 years). The mean age at operation was 42.9 years (21-79 years). Operative results were evaluated according to the Japanese Orthopaedic Association (JOA) score, and subjects were divided into two groups according to their JOA score. (The first group≥80, and the second group<80). The two groups were compared and statistically analyzed according to the following six criteria: sex, age at surgery, stage of avascular necrosis, type of endoprosthesis, bilateral involvement, and radiographical results. Radiographical examination included evaluation of outer head migration, sinking and clear zone of the stem, sclerosis of the stem tip and calcar absorption.The average postoperative JOA score for all hips was 83.5 points (range: 47-100 points). The first group consisted of 15 hips and there were 10 hips in the second group. Sclerosis of the stem tip which was prevalent in the second group showed unsatisfactory results.
西日本整形・災害外科学会の論文