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Table 2 Interobserver reliability of all classifications (Su et al., Lewis and Rorabeck, new implant-related classification) according to Cohen Kappa for two independent testers with: κ < 0 poor agreement, κ = 0–0.20 slight, κ = 0.21–0.40 fair, κ = 0.41–0.60 moderate, κ = 0.61–0.80 substantial, κ = 0.81–1.00 (almost) perfect

From: A new classification of TKA periprosthetic femur fractures considering the implant type

interobserver reliability (Kappa) Su et al. classification Lewis & Rorabeck classification new implant-associated classification
without exclusion (n = 55) 0.388 (fair) 0.309 (fair) 0.743 (substantial)
with exclusion (n = 41) 0.633 (substantial) 0.445 (moderate) 0.696 (substantial)
  1. Exclusion is based on implant typ C and D, which are only defined by the new classification