O3336 EXPERIENCE WITH A NOVEL MODULAR FEMORAL STEM FOR DIFFICULT PRIMARY AND REVISION HIP ARTHROPLASTY

Abstract

Introduction: atypical femoral geometry and bone stock loss may make þtting a press þt traditional one-piece stem difþcult, if not impossible. modularity that permits independent þtting of the diaphysis, metaphysis, length, offset, and version may greatly facilitate reconstruction and ultimate clinical performance. Materials and methods: we prospectively evaluated the early clinical results of exactechñs acumatch? m-series prosthesis, a novel three-piece modular femoral stem. eighty-two were implanted in 80 patients. þfty-three of these were primaries and 29 were revisions. the patients were followed prospectively and evaluated with harris hip scores, range of motion, and complications pre-operatively and at ≥ 1-year post-operatively. Results: Harris hip score for primaries was 37 preoperatively and 84 at last follow-up. Harris hip score for revision group was 37 preopera-tively and 79 at last follow-up. Only one dislocation occurred in the 82 cases, in a patient who was revised for recurrent dislocation with deþcient abductors. There were three minor undisplaced calcar fractures in the primary group that did not alter the clinical outcome and in no case did the prosthesis penetrate the diaphysis. One prosthesis has been removed, and this was due to sepsis in the primary group. Conclusion: Through atraumatic milling of the bone and insertion of the implants, a minimal amount of intra-operative complications resulted. Ultimate restoration of hip biomechanics and soft tissue tension resulted in good clinical outcome with a very low dislocation rate.