The undersurface of the patella was evaluated using the Outerbridge Rating System [8] and the location of wear (medial or lateral facet or central ridge) was recorded. The Outerbridge Rating ...
In addition, patellar derangements were described in 40 of the patients. These took the form of bone bruising to the medial facet (n = 30) and chondral injuries (n = 10). The chondral injuries were ...