Fig. 2From: Patellar instability: the reliability of magnetic resonance imaging measurement parametersMeasurements for trochlear dysplasia: a sulcus angle (SA) is the angle between M and L; b lateral trochlear inclination (LTI) is the angle between I and A; c trochlear facet asymmetry (TFA) = M/L; and (d) trochlear groove depth (TGD) = (M + L)/2 − JBack to article page