Minimum Five-Year Follow-Up Wear Measurement of Longevity Highly Cross-Linked Polyethylene Cup Against Cobalt-Chromium or Zirconia Heads
Received 18 March 2009; accepted 25 September 2009. published online 02 November 2009. Corrected Proof
Abstract
We investigated the efficacy of combining highly cross-linked polyethylene with ceramic heads on further reduction in polyethylene wear compared with the combination with cobalt-chromium heads via PolyWare computer-assisted method. A prospective cohort study was performed on 102 cementless total hip arthroplasties using Longevity (Zimmer, Warsaw, Ind) highly cross-linked polyethylene liners. Either 26-mm zirconia heads or 26-mm cobalt-chromium heads were randomly used in 51 hips each. At a mean follow-up of 6.7 years, no significant differences were identified between the groups for total penetration rate and steady-state wear rate. Osteolysis was not observed in any hips in either group. In conclusion, no advantage was seen for the 26-mm zirconia head compared with the 26-mm cobalt-chromium head in this period.
⁎Department of Orthopaedic Surgery, Osaka University, Graduate School of Medicine, Osaka, Japan
†Department of Orthopaedic Surgery, Kyowakai Hospital, Osaka, Japan
‡Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, Osaka, Japan
§Department of Orthopaedic Surgery, Osaka National Hospital, Osaka, Japan
Reprint requests: Nobuhiko Sugano, MD, PhD, Osaka University Graduate School of Medicine, Department of Orthopaedic Surgery, 2-2 Yamadaoka, Suita, Osaka, 5650871 Japan.
No benefits or funds were received in support of the study.
ABSTRACT