Most of the collateral ligament injuries need 6-8 weeks to recover, the details are as follows: First, partial rupture of the collateral ligament, usually immobilized by plaster or splint, bed rest, exercise the muscles around the ligament, wear a plaster or splint after one week to leave the bed and move around, and then remove the ex-fixation after six weeks to practice the flexion and extension of the neighboring joints. Secondly, complete rupture of the collateral ligament requires surgical treatment, such as ligament stop reconstruction or ligament reconstruction, and after the surgery, it is necessary to wear a brace to carry out rehabilitation training to restore the muscle strength and the range of motion of the neighboring joints. Through the above treatment, the lateral collateral ligament can be fully recovered in 6-8 weeks, and at the same time, rehabilitation training should be emphasized to restore the integrity and continuity of the ligament, as well as the muscle power and strength around the ligament, and attention should be paid to the protection of the collateral ligament, to avoid reoccurrence of injury.