Meniscus injury 3 months is able to do flexion of the knee, at this time for flexion of the knee activities, the site of meniscus injury does not have much effect. 1. After meniscus injury, it is recommended that patients go to the hospital in time to improve the knee X-ray and MRI and other tests to clarify the degree of meniscus injury. 2. For 1 degree and 2 degree meniscus injury, conservative treatment can be carried out through rest, braking and oral pain relief and anti-inflammatory drugs such as celecoxib, etc.; if it is the third degree of injury, it is mostly obvious tear, which requires surgical treatment. 3. knee meniscus injury, according to the degree of injury, can be different time to flex the knee exercise, if the patient is the most serious third-degree injury, after surgery, generally can be more than three weeks after the operation to flex the knee exercise, flexion exercise to 90 degrees is possible. 4. Meniscus injury for three months, the general local joint tissue congestion, swelling will be significantly recovered, the discomfort of the symptoms will also have a certain degree of reduction, at this time it is recommended to follow the doctor’s instructions to carry out appropriate and effective rehabilitation exercises, in order to help recovery. Please consult your attending physician for details on what kind of movement and range of motion you can do after 3 months of meniscus injury.