Background and objective: Anterior cruciate ligament (ACL) injuries are the most common knee injury, accounting for around 45% of sports-related injuries. An ACL injury is linked to discomfort, joint instability, muscular weakening, functional limitations, diminished quality of life, and a heightened risk of knee-related osteoarthritis. The preoperative physiotherapy exercise rehabilitation program is typically conducted to prepare the knee for reconstruction surgery and to enhance rehabilitation outcomes. The aim of our study was to assess the impact of preoperative rehabilitation on the results of ACL reconstruction (ACLR) utilizing the International Knee Documentation Committee (IKDC) score, Tegner Lysholm score, Knee Injury and Osteoarthritis Outcome Score (KOOS), and patients’ symptoms, including tenderness, effusion, and limitations in range of motion (ROM). Materials and Methods: This study comprised 30 patients with ACL injuries, who provided informed consent and were followed for a duration of 12 months. A comprehensive history and assessment were conducted. All patients fulfilling the inclusion criteria were randomly assigned to two groups: one group had a 12-week preoperative rehabilitation program, while the other group proceeded to surgery without preoperative rehabilitation. Both preoperative and postoperative assessments for each group were conducted at 3-, 6-, and 12-month intervals utilizing the IKDC, KOOS, and Tegner Lysholm scores. Results: Analysis revealed a significant rise in the mean IKDC, KOOS, and Tegner Lysholm scores for all patients from the preoperative period to 12 months postoperatively. A statistically significant difference was observed between the prehab and nonprehab groups in each of these measures, with the prehab group exhibiting superior functional ratings. Conclusion: In people with an ACL tear, arthroscopic ACL reconstruction enhanced functional outcomes, with those doing preoperative rehabilitation demonstrating superior functional score assessments.