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Table 4 Comparison of polyethylene wear against yttria stabilized zirconia, cobalt chromium, and alumina heads

From: In vivo wear performance of highly cross-linked polyethylene vs. yttria stabilized zirconia and alumina stabilized zirconia at a mean seven-year follow-up

  Mean Followup Penetration Rate (mm/year) P value
  (years) Yttria Stabilized Zirconia Cobalt Chromium Alumina  
Stilling et al. [20]     5 0.23 0.25   0.46
Cohn et al. [9]     4 0.14 0.11   0.07
Kim [4]     7 0.08 0.17   0
Kraay et al. [31]     4 0.06 0.05   n.a.**
Nakahara et al. [13]     7 0.03* 0.03*   0.77
Hernigou et al. [26]     5 0.04   0.04 n.a.**
    12 0.41   0.07 0.01
Liang et al. [10]     5 0.13   0.08 <0.01
  1. *highly cross-linked polyethylene.
  2. ** not available (no significance).