Fig. 5From: Changes in patellar morphology following surgical correction of recurrent patellar dislocation in childrenThe patellar width (PW) is the length between the medial (A) and lateral edge (B) of the patella. The patellar thickness (PT) is the length between the patellar front polar (C) and back polar (D). The modified Wiberg index is defined as the ratio of the transverse length of the lateral patellar facet (AE) to the medial patellar facet (BE)Back to article page