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Table 3 Intra- and inter-observer precision of 3D calcaneal morphological measurements

From: Measurement of three-dimensional morphological characteristics of the calcaneus using CT image post-processing

  Intra-observer Inter-observer
Examiner 1 Examiner 1 vs. 2 Examiner 1 vs. 3 Examiner 2 vs. 3
RMS-SD CV (%) RMS-SD CV (%) RMS-SD CV (%) RMS-SD CV (%)
LCA (mm) 0.6 0.8 1.5 2.1 0.8 1.0 1.6 2.2
HPF (mm) 0.4 1.6 0.5 1.9 1.1 3.8 1.1 3.8
LPF (mm) 0.5 1.9 0.7 2.9 1.0 4.1 1.3 5.1
LAP (mm) 0.4 1.9 0.6 3.0 0.4 2.1 0.6 2.7
HAP (mm) 0.4 1.7 0.6 2.3 0.8 3.0 0.8 3.2
GA (deg) 1.2 NA 2.2 NA 1.6 NA 2.5 NA
BA (deg) 1.0 NA 1.2 NA 1.5 NA 1.7 NA
APF (cm2) 0.25 1.9 0.40 3.0 0.31 2.3 0.37 2.8
AMF (cm2) 0.19 3.6 0.24 4.5 0.28 5.1 0.34 6.2
  1. RMS-SD = root mean square standard deviation; CV = coefficient of variation; NA = not applicable; LCA = length of calcaneal axis; HPF = height of posterior facet; LPF = length of posterior facet; LAP = length of anterior process; HAP = height of anterior process; GA = Gissane's angle; BA = Böhler's angle; APF = area of posterior facet; AMF = area of middle facet.