Vibration and Post-traumatic Osteoarthritis Risk Following ACL Injury

Inclusion Criteria: * Age 16 to 35 years * Unilateral, primary ACLR with bone-patellar tendon-bone autograft Exclusion Criteria: * History of prior ACL injury or revision ACLR * History of prior knee surgery * Requirement of multiple ligament surgery at time of ACLR * Concomitant injuries or surgical procedures at the time of ACLR that would delay early post-operative weight bearing based on surgeon recommendations (e.g. lower extremity fracture, intra-articular fracture, microfracture procedure) * Removal of more than 1/3 of the medial or lateral meniscus at the time of ACLR * Articular cartilage damage greater than 3A on the International Cartilage Repair Society Criteria at the time of ACLR * History of musculoskeletal injury to either leg in the 3 months prior to participation other than primary ACL injury * Prior diagnosis of radiographic OA in any joint of the lower extremity * History of neurological disorder (e.g. stroke, multiple sclerosis, etc.) * Contraindications for MRI (e.g. extreme claustrophobia, cardiac pacemaker, cochlear implant, metal foreign bodies, aneurism clip, etc.) * Pregnant or planning to become pregnant