Fig. 2From: Patellar shape is associated with femoral trochlear morphology in individuals with mature skeletal developmentWiberg classification for patella morphology [13, 14]. Wiberg type I patella (the left):medial facet equal size as lateral facet; Wiberg type II patella (the center) : medial facet smaller than lateral facet; Wiberg type III patella (the right) : medial facet very much smaller than lateral facetBack to article page