Total Hip Replacement Arthroplasty with the Mallory-Head System : Minimum 8-Year Follow-up Results

ABSTRACT

PURPOSE: The purpose of this study was to assess the clinical and radiographic results of total hip arthroplasty with using the double tapered Mallory-Head system. MATERIALS AND METHODS: The clinical and radiographic results of a consecutive series of 81 total hip replacements in 75 patients were reviewed at eight to twelve years (average 9.8 years) postoperatively. The underlying diseases were avascular necrosis in 46 hips (57%), osteoarthritis in 12 hips (15%), RA in 9 hips (11%) and others. The clinical result was evaluated on the basis of the modified Harris hip score and the modified Merle d'Aubigne-Postel score. A radiographic analysis was also performed. RESULTS: The average modified Harris hip score was improved from preoperative 56 points to postoperative 92 points. The average modified Merle d'Aubigne-Postel score was 15 points at the latest follow up, and 55 hips (68%) were classified as having clinical grades of excellent or good results. One acetabular component was revised because of loosening, and one was revised because of recurrent dislocation. CONCLUSION: The clinical and radiological evaluations of the total hip replacements using the Mallory-Head system showed good results.