When patients have knee pain, the following exercises can be performed: 1. Non-weight-bearing functional exercises: you can perform functional exercises for knee mobility at the bedside, sitting at the bedside to lift and extend the knee joint and flex the knee joint, gradually making the mobility of the knee joint reach normal. 2. Resistance functional training: place a sandbag at the ankle joint, lift and extend the knee joint under the resistance of the gravity of the sandbag, and tie a leather band at the ankle joint to flex it with force, so that This is a functional training for the rehabilitation of the knee joint in flexion, and through resistance functional training, the strength of the quadriceps and hamstrings can be enhanced. 3, functional exercise for swimming: the knee joint does not need to bear weight when swimming, so it is also a non-weight-bearing functional exercise, which can better improve the muscle strength around the knee joint and relieve the pain of the joint.