The purpose of rehabilitation after anterior cruciate ligament (ACL) reconstruction is to bring the patient to the level of physical activity before injury, safely and with adequate knee function. In fact, pre-operative rehabilitation can be planned for patients with ACL rupture and contribution can be made to functional performance in the post-operative period. The first 4 weeks after ACL reconstruction is the weakest graft period. Therefore, during rehabilitation, the healing and development process of the graft should be considered. It is important to gain an early joint range of motion. Increasing the range of motion helps to reduce pain, regulate cartilage hemostasis and prevent patellofemoral joint problems. After isolated ACL reconstruction, it is recommended that patients put full weight on their limbs. Strengthening exercises are started on the first day after surgery. Quadriceps inhibition is the most common problem after ACL reconstruction. The rate of return to sports after ACL reconstruction with good rehabilitation is approximately 50% in the first year. After ACL reconstruction, decision-making should be made with objective performance based tests (muscle strength, balance, jump), subjective scores (questionnaires evaluating knee function and kinesiophobia) and clinical examination (laxity, pain, edema, etc.).