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

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)