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This case study investigated changes in an injured athlete’s function, gait kinematics and parameters, and strength over nine months of ACL rehabilitation. The participant completed laboratory assessments at 6, 12, 24, and 36 weeks post-op, which included a functional outcome questionnaire, a gait evaluation with an electromagnetic tracking system and force plates, and a strength test with an isokinetic dynamometer. Left to right side differences in function, gait kinematics and parameters, and strength were assessed non-parametrically. Results indicated persistent strength disparities and dysfunction at terminal knee extension, even when return-to-play was approved clinically. Kinematics may be useful to guide a continuing rehabilitation program. Strength measures appear to be the most useful for describing rehabilitation progress and effectiveness.