ACL reconstruction is a surgical procedure to replace a torn anterior cruciate ligament (ACL), which is a key ligament in the knee joint. The ACL helps stabilize the knee during activities such as running, jumping, and sudden changes in direction. Injury to the ACL is common in sports or physical activities involving quick movements and twisting. During the procedure, the torn ACL is replaced with a graft, often taken from a patient’s tendon (like the patellar or hamstring tendon) or from a donor. The goal is to restore knee stability and function, allowing patients to return to their daily activities or sports.