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Centroid and size of lesions for each main pattern: a, mixed; b, medial femoral condyle (MFC); c, lateral femoral condyle (LFC); d, patellofemoral groove (PFG); subpattern a1, mixed small; subpattern a2, MFC small; subpattern a3, PFG small within each anatomical location of (A) PFG, (B) LFC, and (C) MFC. Arrows indicate possible pathways of lesion progression from subpatterns to main patterns. *P < 0.05 for differences in lesion centroid location. Mean ± SEM, n = 5 to 39.
