Less wear with aluminium-oxide heads than cobalt-chrome heads with ultra high molecular weight cemented polyethylene cups: A ten-year follow-up with radiostereometry
2012 (English)In: International Orthopaedics, ISSN 0341-2695, E-ISSN 1432-5195, Vol. 36, no 3, 485-490 p.Article in journal (Refereed) Published
Purpose Wear is a major contributor to osteolysis and aseptic loosening of total hip replacements (THR). Both alumina (Al2O3) and cobalt-chrome (CoCr) femoral heads are commonly used. We investigated wear comparing alumina heads to cobalt-chrome heads against conventional cemented polyethylene (PE) cups for up to ten years. Methods Linear wear was measured with radiostereometry (RSA). Our material was derived from two prospective randomised trials that investigated fixation of femoral stems, not wear, and was evaluated retrospectively (Level III). Results The mean (95% CI) proximal head penetration was 0.96 mm (0.68-1.23) in the cobalt-chrome group and 0.42 mm (0.30-0.53) in the alumina group at ten years (P=0.001). The mean (95% CI) 3D penetration was 1.07 mm (0.79-1.35) and 0.53 mm (0.38-0.63), respectively, at ten years (P=0.001). Conclusion Alumina heads performed better than cobalt-chrome heads in this study after ten-year follow-up.
Place, publisher, year, edition, pages
2012. Vol. 36, no 3, 485-490 p.
IdentifiersURN: urn:nbn:se:umu:diva-55390DOI: 10.1007/s00264-011-1334-3ISI: 000302172300002OAI: oai:DiVA.org:umu-55390DiVA: diva2:529153