Altered tibiofemoral position following ACL reconstruction is associated with cartilage matrix changes: A voxel‐based relaxometry analysis

The purpose of this study was to analyze the relationship between postsurgical tibial translation (TT) and tibial rotation (TR) with cartilage matrix changes using quantitative magnetic resonance imaging, specifically voxel‐based relaxometry with T1ρ and T2 mapping sequences. Knee magnetic resonance imaging's (MRI's) of 51 patients with unilateral anterior cruciate ligament injury, no concomitant ligamentous injury, history of osteoarthritis (OA), and previous knee surgery were scanned prior to surgery. Thirty‐four patients completed follow‐up MRI scans at 6‐month, 1‐ and 2‐year post‐reconstruction and were included in this study. Knee biomechanics, T1ρ, and T2 were calculated using an in‐house Matlab program. Compared to the contralateral knee, the injured knee demonstrated significantly increased anterior TT at baseline (P