MIGRATION OF UNCEMENTED, LONG-STEM FEMORAL COMPONENTS IN REVISION HIP-ARTHROPLASTY - A 2-8-YEAR CLINICAL FOLLOW-UP OF 45 CASES AND RADIOSTEREOMETRIC ANALYSIS OF 13 CASES

We reviewed after 48 (24-90) months the clinical results in 45 cases o f revision hip arthroplasties where an uncemented, long-stem femoral p rosthesis (BIAS(R), Zimmer) had been used. A subgroup of 13 cases was followed with radiostereometric analysis (RSA) for 2 years. 3/45 cases had been rerevised, another 12 had unsatisfactory pain scores. The me dian Harris score was 69 (26-99). 12/13 stems migrated; 11 subsided 4. 1 (0.4-7.9) mm, and 8 migrated posteriorly 2.9 (1.9-9.6) mm. The poor clinical results and large migrations speak against the use of this pr osthesis in revision hip arthroplasty.