After a knee injury, the patient needs bed rest and resting, which will easily lead to disuse atrophy of the muscles of the leg in the knee area. Early and proper rehabilitation exercises should be performed without affecting the recovery of muscle tissue. Specific exercises can be performed by telling the patient to take a standing position with the feet on the ground bilaterally and encouraging the patient to squat down at the hips as much as possible to maximize the range of motion of the knee joint. In addition, you can also tell the patient to take a prone position, relax the whole body, and lift the patient’s heel area towards the hip, which can be insisted on for 10-15 seconds. 4-5 sets of exercises per day can quickly restore the elasticity and toughness of the local muscles and ligaments, strengthen the local muscle strength and increase joint stability.