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Metal-Backed Versus All-Polyethylene Tibias in Megaprostheses of the Distal Femur

Authors
Journal
The Journal of Arthroplasty
0883-5403
Publisher
Elsevier
Publication Date
Volume
26
Issue
3
Identifiers
DOI: 10.1016/j.arth.2010.01.007
Keywords
  • Distal Femur
  • Megaprosthesis
  • Endoprosthesis
  • Metal-Backed
  • All-Polyethylene
  • Tibial Component
  • Oncology Implant

Abstract

Abstract In megaprostheses, the tibial component is rarely a source of failure. The evolution of these implants has followed standard arthroplasty trends moving from majority use of all-polyethylene tibias (APT) to high volume use of metal-backed tibial (MBT) components. We report the results of 72 endoprostheses using either MBT (n = 42) or APT (n = 30) implanted between 1994 and 2006. Failures of the implant related to the tibial component were isolated, and 5-year survival of the tibial implant of the MBT cohort was 94%, and for the APT cohort, 87% ( P = .39). The difference in tibial component failures between the 2 groups was not statistically significant (Pearson χ 2 = 0.1535, P = .6952). Revision rates for the entire implant and infection rates were not significantly different between the 2 groups.

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