Fig. 2From: Imaging evaluation of patellofemoral joint instability: a reviewFat-saturated proton density-weighted magnetic resonance images demonstrating the measurements of the indices to assess trochlear dysplasia. a Sulcus angle (∠θ) and trochlear facet asymmetry (MF/LF). b Lateral trochlear inclination (∠θ). c Trochlear groove depth ((MF + LF)/2–TG) (An alternative method is presented by the dashed line). d Ventral trochlear prominence (length T)Back to article page