The Impact of Blood Flow Restriction Training in Adolescents After ACL Reconstruction: A Randomized Controlled Trial

Inclusion Criteria: * Prior to surgery participated in \>50 hours/year of level I or II sports as defined by Noyes et al and planned to return to prior level. Level I Sports (4-7 days/week) Jumping, hard pivoting, cutting (basketball, volleyball,football, soccer, gymnastics, skiing. wrestling) * Level II sports (1-3 days/week) Jumping, hard pivoting, cutting (basketball, volleyball,football, soccer, gymnastics, skiing. wrestling) * Completion of postoperative rehabilitation following standard protocols * Orthopedic surgical intervention and physical therapy completed at Connecticut Children's. Exclusion Criteria: * An additional lower extremity injury at time of knee injury or previous surgical intervention on the knee (ipsilateral and contralateral) * Multiple ligament ruptures or trauma * Weight bearing restrictions for greater than 4 weeks after surgery due to concomitant pathology such as meniscal root/radial repair, chondral pathology, or multi-ligament pathology * Follow-up surgical procedures including, but not limited to, post-operative arthrofibrosis Inability to attend regular physical therapy sessions (≥80% of patient treatment sessions and all assessment visits * Contraindications to performing BFRT including known history of central or peripheral neurologic impairments, cardiac or metabolic condition or history of deep vein thrombosis (DVT).