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) |