Polyethylene wear and cup migration of cemented total hip arthroplasty with femoral heads made of oxidized zirconium, steel, or cobalt chromium: a 10-year secondary analysis from a randomized trial using radiostereometry
DOI:
https://doi.org/10.2340/17453674.2024.41945Keywords:
Cemented Total Hip Arthroplasty, Highly crosslinked polyethylene, Oxinium, Radiostereometric AnalysisAbstract
Background and purpose: We aimed to evaluate polyethylene (PE) wear, cup migration, and clinical outcome over 10 years in total hip arthroplasties (THA) using different articulations.
Methods: This is a secondary analysis of 150 patients randomized into 5 groups, using different articulations: Charnley/Charnley Ogee for steel and conventional polyethylene (CPE), or Spectron EF/Reflection with either CPE or highly cross linked polyethylene (XLPE) cups, paired with heads made of either cobalt-chromium (CoCr) or oxidized zirconium (OxZr). All cups were cemented. Patients underwent repeated radiostereometric analysis (RSA) measurements for up to 10 years to assess wear and migration. Clinical outcome was assessed using Harris Hip Score (HHS).
Results: After 10 years, the XLPE cups demonstrated low wear rates: 0.08 mm (95% confidence interval [CI] –0.11 to 0.26 mm) with CoCr heads and 0.06 mm (CI –0.14 to 0.26 mm) with OxZr heads, with a mean difference of 0.01 mm (CI –0.26 to 0.29 mm). In contrast, CPE cups exhibited significantly more wear: 1.35 mm (CI 1.16 to 1.55 mm) with CoCr heads and 1.68 mm (CI 1.44 to 1.92 mm) with OxZr heads, with a mean difference of 0.33 mm (CI 0.02 to 0.64 mm). The Charnley/Ogee group (CPE) showed PE wear of 0.34 mm (CI 0.12 to 0.56 mm). The CPE groups with OxZr and CoCr heads had 0.67 mm (CI 0.38 to 0.96 mm) and 0.35 mm (CI 0.09 to 0.61 mm) greater proximal migration respectively than the corresponding XLPE groups. HHS was similar across all groups.
Conclusion: We found no significant advantage of OxZr over CoCr heads in reducing wear or migration. XLPE demonstrated a major reduction in wear as well as a reduction in cup migration compared with CPE. Charnley performed better than the other CPE cups in terms of PE wear and cup migration. No differences in clinical outcome were found.
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Copyright (c) 2024 Håkon Greve Johannessen, Geir Hallan, Thomas Kadar, Anne Marie Fenstad, Stein Håkon Låstad Lygre, Kristin Haugan, Paul Johan Høl, Mona Badawy, Benedikt Jonsson, Kari Indrekvam, Arild Aamodt, Ove Furnes
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