Table 3: Intraclass correlation coefficient for intra- and interobserver reliability for the different radiographic measurements and ratios.

MeasureIntraobserver reliabilityInterobserver reliability
95% CI value 95% CI value

Joint line0.950.87 to 0.98<0.0010.830.09 to 0.95<0.001
PCO0.940.74 to 0.98<0.0010.840.1 to 0.95<0.001
Femoral diaphysis0.890.79 to 0.95<0.0010.810.02 to 0.95<0.001
Joint line ratio0.840.68 to 0.92<0.0010.930.85 to 0.96<0.001
PCO ratio0.900.63 to 0.96<0.0010.930.86 to 0.97<0.001