Recently, the follow-up of patients after patellar dislocation correction (mainly minimally invasive arthroscopic medial support band tightening + lateral support band release) revealed that some patients, although they have basically resumed their daily life after surgery, still have the feeling of unstable knee joint and weak leg when participating in sports activities, which is mainly caused by the lack of muscle strength and joint flexibility in the lower limbs. Therefore, we recommend an international classic rehabilitation exercise method for patellar subluxation/hemisubluxation, which is mainly applicable to patients suffering from patellar subluxation or hemipelvectation who have not undergone surgery or are more than 6 months post-surgery. For rehabilitation training within 6 months of surgery, it is recommended that the rehabilitation program developed by the attending physician and rehabilitation specialist should prevail. Patellar dislocation / subluxation rehabilitation exercises The rehabilitation exercises for patellar dislocation / subluxation are simple and easy to perform. The exercises focus on stretching exercises for the posterior and lateral muscles of the thigh and muscle strength exercises for the anterior thigh. I. Hamstring stretching exercises in standing position 1. Straighten the affected leg and place the heel on a low stool about 40 cm high; 2. Lean the body forward with the hip joint as the axis until you feel a mild pulling sensation in the back of the thigh and maintain the posture; 3. Pay attention to keeping the shoulders balanced and the back straight, do not turn the shoulders or arch the back; 4. Do 3 sets of exercises per day, 3 times per set, and insist on 15-30 seconds each time. B. Quadriceps stretching exercises 1. stand sideways at the wall, with the body about 30 cm from the wall and the affected leg outside; 2. bend the knee of the affected leg backwards and hold the ankle joint with your hand, and force the heel close to the hip; 3. pay attention to keep your eyes facing straight ahead and your back straight, do not lower your head or arch your back; 4. practice, 3 sets per day, 3 times per set, and insist on 15-30 seconds each time. Third, side lying leg lift exercise 1, side lying position, the affected leg on the top; 2, the affected leg straight, raised up about 30 cm, maintain the posture does not move; 3, pay attention to the leg down evenly and slowly; 4, practice, 3 groups per day, each group of 10 times, each time adhere to 10 seconds. Four, sitting quadriceps contraction exercises 1, sitting position, the affected leg straight, the healthy leg flexion; 2, the back of the knee (popliteal fossa) force, downward pressure on the bed, feel the quadriceps contraction tense; 3, practice, 3 groups per day, each group of 10 times, each time adhere to 10 seconds. 5, straight leg exercises 1, semi-supine position, and the healthy side of the leg knee bent, in order to make the sole of the foot on the bed; 2, the affected leg straight, quadriceps muscle contraction tense, and lift the leg off the bed about 20 cm, maintain the posture; 3, pay attention to the knee joint do not bend, do not lift the leg too high, leg down uniformly slow; 4, practice, 3 groups per day, each group of 10 times, each time adhere to the power exhaustion, the longer the better. The longer the better. Six, stirrup step exercise 1, standing position, the healthy side of the leg on the ground, the affected leg stepped on a 8-13 cm steps or bricks; 2, the body weight to the affected leg, and up stirrup step on the step, the healthy side of the leg off the ground; 3, pay attention to the healthy side of the leg down when the action is uniformly slow; 4, practice, 3 groups per day, 10 times per group. Seven, against the ball against the wall squat exercises 1, back to the wall standing, feet apart and shoulder width, the heel is about 60 cm from the wall; 2, the basketball or soccer placed in the middle of the waist, backward force the ball against the wall; 3, slowly squat to make the ball slide to the shoulders, knee flexion of about 45 degrees, maintain the posture does not move; 4, pay attention to keep the shoulders relaxed, torso straight, sliding when the action is uniformly slow; 5, practice, 3 sets per day, 10 times per set. Each group of 10 times, each time adhere to 10 seconds. Knee stability exercises Prepare about 1.5-2 meters long elastic band or tension piece, knot both ends to make a double-stranded ring, knotted end fixed in the doorway or bed leg, the other end set on the ankle joint of the healthy side of the leg. A forward stability exercises 1, facing the door standing, body weight on the affected leg and make the knee slightly flexed; 2, the healthy leg backward force, pulling the elastic band. Nine, B lateral stability exercises 1, turn 90 degrees, so that the affected leg near the door, the healthy leg away from the door; 2, the healthy leg outward force, pulling the elastic band. Ten, C backward stability exercises 1, then turn 90 degrees, so that the body back to the door standing, knee slightly flexed; 2, the healthy side of the leg forward force, pulling the elastic band. XI, D medial stability exercises 1, then turn the body 90 degrees, so that the healthy leg near the door, the affected leg away from the door; 2, the healthy leg to the medial force, pulling the elastic band; exercises, 3 sets per day, each set of 10 times. If you feel difficulty in standing on one leg, you can prepare a chair and hold the back of the chair with your hand to help balance. Twelve, knee straightening resistance exercises 1, prepare about 1.5-2 meters long elastic band or tension piece, both ends knotted into a double-stranded loop, knotted end fixed on the doorway; 2, facing the door standing, knee flexion 45 degrees, the elastic band on the affected leg behind the knee joint (popliteal fossa); 3, the affected leg single-leg weight, and slowly straighten the knee joint, pulling back the elastic band; 4, if you feel the difficulty of standing on one leg If you feel difficulty in standing on one leg, you can prepare a chair, hand on the back of the chair to help balance; 5, when practicing, 3 sets of 10 times per day. Thirteen, standing gastrocnemius stretching exercises 1, standing facing the wall, leaning forward, hands on the wall and shoulder height, legs in a lunge, the affected leg in the back, and keep the full foot on the ground; 2, the affected leg heel gently rotate outward, while the body continues to tilt to the wall, until the back of the calf pulling sensation, maintain the posture does not move; 3, each group of exercises, you can exchange the position of the legs, each exercise 3 times; 4, when practicing 3-5 groups per day, each group of 3 times, each lasting about 15-30 seconds. XIV, side lying legs open and close exercise 1, to the healthy side of the lying, hip and knee slightly flexed, feet together; 2, slowly open the affected leg, and maintain 2 seconds, and then slowly close the legs; 3, practice, 3 groups per day, each group of 10 times, each time adhere to 2 seconds. Fifteen, iliotibial stretching exercises 1, crossed legs, the affected leg in the back, the affected side of the arm stretched up against the ear; 2, the body tilted to the healthy side, until the affected side of the iliotibial tract pulling sensation, maintain the posture does not move; 3, each group of exercises, you can exchange the position of the legs, each exercise 3 times; 4, exercises, 3-5 groups per day, each group of 3 times, each time lasted about 15-30 seconds.