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Categorization of patella alta using the Caton-Deschamps index in pain free and patellofemoral pain (PFP) subjects (total n = 52). The histogram distribution of Caton-Deschamps index (A) was fit with a Gaussian model (A, B: solid lines). A subject was categorized with patella alta if his/her patella height was greater than the 75th percentile threshold value (A: shaded region, B: vertical dashed line).
