Knee ligaments usually recover in 3 to 4 weeks if they are torn in small portions. If the ligament is mostly torn, it takes about 3 to 6 months to recover completely. If the knee is injured with a small amount of violence causing only a small part of the ligament to be strained or torn, the knee can be immobilized by bed rest and the use of plaster casts or braces, and recovery is usually possible in 3~4 weeks. If the injury is more violent, causing most of the ligaments to be torn, such as the medial and lateral collateral ligaments, cruciate ligaments, etc., it is usually difficult to recover by oneself, and most of them need to undergo surgical treatment. Such as arthroscopic cruciate ligament repair. After the surgery, you can wear a brace to get out of bed in half a month or so, and it takes 3 to 6 months for full recovery. If the knee ligament is torn due to accidental trauma, it is recommended that the patient go to the hospital for a complete examination and receive regular treatment.