OBJECTIVE: To evaluate the clinical and radiographic results of 30 cases of revision total hip arthroplasty using a modular cementless distal fixation prosthesis: the ZMR® Hip System. METHOD: From July 2005 to December 2008, 30 cases were operated on (14 men and 14 women). Two male patients had bilateral surgery. Average age was 59.2 years (29-81 years), with average follow-up of 24 months. The Paprosky classification was used to evaluate periprosthetic bone loss, and the Harry Hip Score (HHS) was used to evaluate clinical results. Bone remodelling was assessed using the Callaghan classification. RESULTS: The preoperative HHS showed an average value of 39, and showed a significant increase to 93 points in the final evaluation, which translates into excellent clinical results. No femoral stem migration greater than 5mm (Sporer) was observed, suggesting all femoral prostheses presented osteointegration and were stable from time of surgery until the final evaluation. Proximal femoral remodelling, according to Callaghan, was either type B or C in 29 hips. Seven patients had complications, but none of the latter interfered with osteointegration of the femoral component at the time of the last follow-up. CONCLUSION: Our results with the Revision Total Hip Arthroplasty using the ZMR® Hip System were extremely encouraging and all components remaining fixed until the final evaluation.
Arthroplasty, replacement, hip; Hip prosthesis; Retrospective studies; Adult
