THE SOUTH AFRICAN PATIENT EXPERIENCE WITH THE ASR™ METAL ON METAL HIP SYSTEM WITHIN A WORLDWIDE MULTICENTRE CLINICAL OUTCOME STUDY

Introduction:The ASR™ Articular Surface Replacement and ASR™ XL Metal-on-Metal systems were recalled due to high revision rates at five years. A worldwide clinical follow-up of patients was initiated. This paper summarizes current findings in South Africa (SA) in comparison with those outside SA (OSA).Methods:Patients were followed annually, or until revision, from 10 clinical centers worldwide. Data collected includes demographic, surgical, radiographic, blood metal ion levels, and patient reported outcome measures (PROM).Results:There were 715 (353 ASR/336 ASR-XL) hips enrolled in the study; 187 ASR and 32 ASR-XL from South Africa. The average time from index surgery was 6 years (2–10) for both SA and OSA. Since enrollment, 2.7% (19) hips were revised (none from SA) and of these 58% (11) had adverse local tissue reaction. Blood metal Co/Cr ion levels decreased by about 50% post-revision. There was no difference in average blood metal ion levels between patients in SA and OSA. Globally, the average blood...