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Table 2 Inter- and intrarater reliability (ICC) of the PTS measurements of two readers

From: The EOS 3D imaging system reliably measures posterior tibial slope

  Tibial slope Differences between axes on EOS
EOS EOS CT CT TA-ATC TA-IMA
Medial Lateral Medial Lateral
Interrater 0.880 (0.826–0.917) 0.765 (0.658–0.838) 0.884 (0.832–0.920) 0.887 (0.836–0.922) 0.910 (0.869–0.938) 0.966 (0.951–0.977)
Intrarater 1 0.927 (0.876–0.957) 0.889 (0.810–0.935) 0.956 (0.925–0.974) 0.955 (0.923–0.973) 0.96 (0.932–0.977) 0.986 (0.976–0.992)
Intrarater 2 0.943 (0.903–0.967) 0.975 (0.958–0.986) 0.868 (0.774–0.922) 0.894 (0.820–0.938) 0.911 (0.848–0.948) 0.980 (0.966–0.988)
  1. ICC two-way mixed measures; consistency (95% CI)
  2. < 0.40 = poor, 0.40–0.59 = fair, 0.60–0.74 = good, 0.75–1.00 = excellent
  3. TA Tibial axis, ATC Anterior tibial cortex, IMA Intramedullary axis