Mean measured ultrashort echo time (UTE)-T2* profiles (top row) and mean
fitted four-parameter sigmoidal curves (bottom row) in the central medial tibial
plateau (A,a), central medial femoral condylar (B,b), and posterior medial
femoral condylar cartilage (C,c) averaged across 36 anterior cruciate ligament
reconstruction (ACLR) subjects and 14 uninjured controls. Measured profiles and
calculated sigmoidal curves of uninjured controls appear below those of both
knees of anterior cruciate ligament (ACL)-reconstructed suggesting alterations
to cartilage matrix organization in both knees of ACLR subjects compared to
controls. Percent distance from bone is measured such that 0% indicates
bone cartilage interface, 100% indicates synovial surface. Error bars
represent ± SEM.