Overall, in India each year around 8000-10,000 ACL reconstruction surgeries are performed. Injury to ACL most commonly occurs in athletes. It happens frequently in those who plays sports involving pivoting. The extension lag describes the lack of full extension of knee with full contraction of quadriceps. Also called quadricep lag of knee. To reduce the extension lag physiotherapy is effective treatment. Among them. In current study hypothesized that functional training program and Muscle Energy Technique is more efficacious as compared to conventional training in minimizing quadriceps lag after several knee surgeries. Total 54 subjects fulfilled the inclusion criteria of having knee extension lag. Samples divided into 2 group. Group 1 was experimental and Group 2 was conventional. The Extension lag of knee was found to be significantly reduced in the experimental group which was given functional training and muscle energy technique as compared to the conventional group which was given conventional physiotherapy. Functional training exercises resulted in remarkable reduction in post-operative knee pain. Muscle energy technique helped in improving the strength of the muscles.