This document discusses using real-time 3D motion capture technology to assess movement quality and risk of ACL reinjury in football players returning to sport. 25 elite male football players performed drop jumps, single leg squats, and other tests which were analyzed for biomechanics using the technology. Results showed asymmetry, excessive knee valgus, and other high risk movements. The system can establish baselines, guide rehab to correct mechanics, and help clear players for return to play by ensuring safe, symmetrical movement quality. This pilot study aims to develop normative data to establish evidence-based return to sport guidelines for football players post-ACL injury.