• Int Orthop · Mar 2012

    Randomized Controlled Trial Comparative Study

    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.

    • Jon Dahl, Per Söderlund, Bo Nivbrant, Lars Nordsletten, and Stephan M Röhrl.
    • Orthopaedic Department, Oslo University Hospital, N-0407, Oslo, Norway. jon.dahl@mac.com
    • Int Orthop. 2012 Mar 1; 36 (3): 485-90.

    PurposeWear is a major contributor to osteolysis and aseptic loosening of total hip replacements (THR). Both alumina (Al(2)O(3)) 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.MethodsLinear 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).ResultsThe 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).ConclusionAlumina heads performed better than cobalt-chrome heads in this study after ten-year follow-up.

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