A partial tear of the ACL usually heals in 3 to 6 months with aggressive treatment. For patients with ACL tears, doctors will formulate a treatment plan according to the condition, including conservative treatment and surgery. Some patients with partial rupture of the ligament and lower requirements for sports can choose conservative treatment according to the situation, through rest, limiting the activities of the affected limb, wearing a brace, rehabilitation training and other methods of treatment. It usually takes about 6 months for knee stability to be restored. For patients with unstable knee joints and high requirements for sports, surgery can be considered to restore the stability of the knee joint. After surgery, systematic rehabilitation and functional exercises are needed. 3 to 6 months after surgery, jogging, swimming and other sports can be performed appropriately, and 6 months after surgery, after evaluation by a professional doctor to determine that the knee stability is good, the pre-injury sports can be tried. The most important thing after ACL tear is early and active treatment and standardized rehabilitation exercises. How long it takes to heal has a lot to do with the treatment method and rehabilitation exercises, and requires a professional doctor’s evaluation to determine.