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Total Hip Arthroplasty for the Treatment of Ankylosed Hips A Five to Twenty-one-Year Follow-up Study
Moussa Hamadouche, MD; Luc Kerboull, MD; Alain Meunier, PhD; Jean Pierre Courpied, MD; Marcel Kerboull, MD
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Investigation performed at the Department of Orthopaedic and Reconstructive Surgery, Service A, Centre Hospitalo-Universitaire Cochin-Port Royal, Paris, France
Moussa Hamadouche, MD
Luc Kerboull, MD
Jean Pierre Courpied, MD
Marcel Kerboull, MD
Department of Orthopaedic and Reconstructive Surgery, Service A, Centre Hospitalo-Universitaire Cochin-Port Royal, 27 rue du Faubourg St Jacques, 75014 Paris, France. E-mail address for M. Hamadouche: moussah@club-internet.fr

Alain Meunier, PhD
Orthopaedic Research Laboratory, Faculté de Médecine Lariboisière Saint-Louis, Université D. Diderot, Paris VII, UPRES A CNRS 7052, 10 avenue de Verdun, 75010 Paris, France

No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study.

J Bone Joint Surg Am, 2001 Jul 01;83(7):992-998
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Background: The purpose of the present retrospective study was to report the long-term results of total hip arthroplasty following a hip fusion. Special attention was paid to the resulting function of both the involved joint and the neighboring joints, as pain in the lower back or knee was the usual indication for conversion. The factors that were likely to influence the functional outcome were analyzed.

Methods: Forty-five consecutive total hip arthroplasties were performed in forty-five patients from 1969 through 1993. The mean age of the patients at the time of the operation was 55.8 years (range, twenty-eight to eighty years). Ankylosis of the hip had been spontaneous in twenty patients and postoperative in twenty-five patients. The mean duration of the ankylosis had been thirty-six years (range, three to sixty-five years). The mean duration of follow-up was 8.5 years (range, five to twenty-one years). No patient was lost to follow-up.

Results: The mean hip score, according to the scale of Merle d’Aubigné, was 16.5 1.5 points at the latest follow-up evaluation. Hip function was considered to be satisfactory for forty-one (91%) of the forty-five patients. The definitive score for walking ability was not achieved by the one-year evaluation; it improved notably for two to three years and then it remained stable. At the time of the latest follow-up, the mean arc of flexion was 88° (range, 30° to 130°). Forty-three (96%) of the forty-five patients had no pain in the involved joint. The only factor that was predictive of the final functional result with regard to walking ability was the intraoperative status of the gluteal muscles. Most patients had effective pain relief in the neighboring joints. The cumulative survival rate at eight years, with revision as the end point, was 96.7% (95% confidence interval, 90.2% to 100%).

Conclusions: The long-term effectiveness of total hip arthroplasty for the treatment of an ankylosed hip was clearly demonstrated in both the involved and the neighboring joints in the present study. However, the preoperative and intraoperative status of the gluteal muscles should be carefully evaluated when this procedure is being considered, as this was the only factor that was predictive of the final walking ability.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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