Anterior Cruciate ligament (ACL) is the most common ligament to get damaged in the knee joint. Knee joint being a dynamic structure requires lot of stabilizing factors to maintain dynamic stability of the joint. ACLhelps to maintain dynamic stability of the knee joint by preventing anterior translation of tibia.ACL and PCLserve as primary rotatory stabilizers for knee joint. This case study reflects on the treatment of a case of ACL reconstruction of the left knee. A 50 years old male who met an accident reported with anterior cruciate ligament tear. Patient had reported with swelling over knee region and he had been treated surgically for anterior cruciate ligament reconstruction. The patient was mesomorphic in nature. Physical therapy rehabilitation protocol mainly focused on strengthening of quadriceps and hamstrings muscle and accordingly provided care in ways including postoperative weight bearing, gait training, improving strength of quadriceps and hamstring muscles. Anterior Cruciate Ligament Tear following accidental trauma. Therapeutic Intervention and Post-operative knee brace was given to the patient after surgery which was locked in slight hyperextension. The patient was made aware of the need to wear the brace even while sleeping. CPM machine was used daily for 3 hours per day. Outpatient physiotherapy was started on post-operative day 10. Basic exercises such as active and passive ROM, strengthening exercise for quadriceps, straight leg raising with brace. After 7th week there was complete recovery in passive range of motion of the knee joint. Early postoperative recovery is ensured withtimely initiation of physiotherapy and the motivation to continue with the physiotherapy.