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Average (+1 SD) patella height for pain free and patellofemoral pain (PFP) subjects classified into normal tracking and maltracking groups. Patella height was measured using the (A) Caton-Deschamps, (B) Blackburne-Peel, (C) Insall-Salvati, (D) Modified Insall-Salvati, and (E) Patellotrochlear indices.
