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Table 3 Results of radiological parameters of PFJ morphology and alignment and interclass correlation coefficient tests

From: Association of patellofemoral morphology and alignment with the radiographic severity of patellofemoral osteoarthritis

Parameters Mean (SD; range) Interobserver ICC (95% CI) Intraobserver ICC (95% CI)
Joint space narrowing 1.9 mm (1.1 mm; 0 mm to 4.47 mm) 0.956 (0.906 to 0.979) 0.962 (0.920 to 0.982)
PFJ morphology    
 Sulcus angle 150.6°(9.3°; 124° to 173°) 0.878 (0.703 to 0.939) 0.906 (0.800 to 0.956)
 Lateral trochlear inclination 16.7° (5.2°; 4° to 29°) 0.852(0.684 to 0.930) 0.948 (0.876 to 0.941)
 Medial trochlear inclination 12.5° (6.7°; 1° to 36°) 0.845 (0.651 to 0.947) 0.939 (0.870 to 0.971)
 Wiberg classification _ 0.865 (0.712 to 0.937) 0.869 (0.721 to 0.938)
PFJ alignment    
 Congruence angle 26.4° (21.7°; -38 to 74) 0.860 (0.678 to 0.921) 0.964 (0.922 to 0.983)
 Patella tilt 15.4° (8.3°; 0 to 43) 0.969 (0.934 to 0.985) 0.935 (0.863 to 970)
 Lateral patellar angle 1.63° (6.9°; -28° to 16°) 0.915 (0.781 to 0.912) 0.913 (0.815 to 959)
 Caton-Deschamps index 0.9 (0.1; 0.60 to 1.34) 0.838 (0.655 to 0.924) 0.914 (0.816 to 0.960)
 TT-TG 14.9 (4.8; 0.0 to 28.9) 0.919 (0.827 to 0.962) 0.974 (0.945 to 0.988)
  1. PFJ patellofemoral joint, TT-TG tibial tubercle–trochlear groove distance