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Updated: May 30, 2026
Potentiodynamic Corrosion Testing
Published on: September 4, 2016
Eight-year wear analysis in Longevity highly cross-linked polyethylene liners comparing 26- and 32-mm heads
Ichiro Nakahara1, Nobuo Nakamura, Masaki Takao
1Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
Introduction:
Although wear reduction of highly cross-linked polyethylene has been demonstrated to be independent of femoral head diameter in some simulation studies, the clinical effects of femoral head diameter on wear of highly cross-linked polyethylene sockets remain unclear. We compared the in vivo wear of Longevity highly cross-linked polyethylene liners at 8-year follow-up using 26- or 32-mm cobalt-chromium heads.
Materials And Methods:
A retrospective cohort study was performed on 90 cementless total hip arthroplasties (THAs) using Longevity highly cross-linked polyethylene liners combined with 26- (45 THAs) or 32-mm (45 THAs) cobalt-chromium heads. Annual radiographs were analyzed using PolyWare computer-assisted methods and linear and volumetric total head penetration rates and linear and volumetric steady-state wear rates were compared.
Results:
The two groups showed similar background data, and no significant differences were identified between groups in total head penetration rate or steady-state wear rate. Steady-state wear rates were negligible. Osteolysis was not observed in any hips in either group.
Conclusions:
At the 8-year follow-up, wear of the Longevity was the same irrespective of the use 26- or 32-mm heads.
