64 patients undergoing anterior cruciate ligament (ACL) reconstruction surgery with a patellar tendon autograft were randomized to receive rehabilitation with or without a stabilizing knee brace in order to investigate the effect of a knee brace. Patients were monitored over 4 years based on IKDC 2000, and KT1000 measurements, along with VAS and radiographic outcomes. The application of a brace resulted in similar IKDC 2000 subjective and objective results, and KT1000 laxity, when compared to patients who did not receive a brace. No-brace patients did, however, demonstrate better VAS pain results under sports activity or heavy physical work. Radiographic and complications evaluations were similar between groups.