The Journal of Bone and Joint Surgery, Vol 74, Issue 9 1334-1343, Copyright © 1992 by Journal of Bone and Joint Surgery, Inc

JOURNAL CONTENTS

Operative correction of an unstable total hip arthroplasty

PJ Daly and BF Morrey
Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota 55905.

We reviewed the results of reoperation in ninety-five patients who had acute subluxation (ten patients) or dislocation (eighty-five patients) of the hip after conventional cemented total hip-replacement arthroplasty. Postoperatively, fifty-eight patients (61 per cent) had no subsequent dislocation or subluxation. Seven of thirty-seven patients who had had recurrent dislocation had occasional subluxation during follow-up. Of the remaining thirty patients in whom instability persisted after the reoperation, twenty-eight had at least one dislocation, and nine had bothersome subluxation. Ten of these thirty-seven patients had another operation for the persistent instability. The causes of instability were classified as malrotation of the component, disruption of the trochanteric-abduction mechanism, impingement, or multiple and unknown, and appropriate treatment was provided. The component was revised in forty-five patients, revision and advancement of the trochanteric component was done in twenty-five patients, and impinging bone or cement was removed from six patients; a combination of these procedures was done in nineteen patients. Over-all, fifty-eight procedures (61 per cent) were successful (no additional subluxations or dislocations). We concluded that the results of operative treatment for an unstable total hip replacement can be optimized when a precise determination of the cause of the instability is made and appropriate measures are applied.
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