This study aims to compare the effects of a preemptive multimodal intravenous analgesia protocol and a femoral triangle block on early postoperative rehabilitation compliance in patients undergoing anterior cruciate ligament (ACL) reconstruction under general anesthesia. Adult patients aged 18 to 65 will be randomized to receive either multimodal intravenous analgesia or femoral triangle block prior to surgery. Rehabilitation compliance will be evaluated using the straight leg raise test, sit-to-stand success, and pain scores at multiple postoperative time points. Secondary outcomes include opioid consumption, incidence of opioid-related side effects.