Abstract #2751

Tibial Rotation and Knee Flexion Moment Correlate to Patellofemoral Deep Cartilage UTE-T2* 2 Years After ACL Reconstruction

Ashley A Williams^1,2, Jennifer Erhart-Hledik^1,2, Jessica L. Asay^2,3, Gordhan Mahtani^1,2, and Constance R. Chu^1,2

¹Orthopaedic Surgery, Stanford University, Stanford, CA, United States, ²Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, United States, ³Mechanical Engineering, Stanford University, Stanford, CA, United States

Patellofemoral joint osteoarthritis (PFOA) following anterior cruciate ligament reconstruction (ACLR) is thought to arise, in part, due to increased external rotation of the tibia and decreased quadriceps strength that alter the tracking of the patella in the trochlear groove. In this study of 59 subjects 2 years after ACLR, higher cartilage UTE-T2* values were detected in ACLR knees with greater external tibial rotations and greater knee flexion moments assessed by gait analysis. This study provides evidence that UTE-T2* is sensitive to patellofemoral cartilage degeneration likely due to altered patellar tracking and quadriceps strength in knees at risk of PFOA.

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