Primary ACL reconstruction using a contralateral patellar tendon autograft is an effective means of achieving symmetrical range of motion and strength after surgery. When the graft is harvested from the ipsilateral knee, the rehabilitation for the ACL graft and for the graft-donor site are different and have opposing goals. Rehabilitation for the ACL graft involves obtaining full range of motion, reducing swelling, and providing the appropriate stress to achieve graft maturation. Rehabilitation for the graft-donor site involves performing high-repetition strengthening exercises to regain size and strength, best achieved when begun immediately after surgery.