Common exercise methods for patellar instability include medial femoral muscle muscle strength training, gluteal muscle strength training, and anterior thigh muscle stretching training. 1. medial femoral muscle muscle training: medial femoral muscle strength can pull the patella to the inside, thus reducing the friction between the patellar cartilage and the femoral condyle. Specific method: lie flat on the bed with legs straight, put a rolled towel on one leg below the popliteal fossa, so that the knee is bent, and then lift the foot away from the bed, completely straighten the knee, feel the inner thigh muscles, 10 seconds after the slow down. 2. Gluteal muscle training: strong gluteal muscle strength can prevent the femur from rotating internally and reduce the friction between the femur and the patellar cartilage. Specific practice is to lie flat on the bed, knee flexion, feet on the bed, knees and hips the same width, pelvic tilt back to make the waist close to the bed, hip force will be lifted off the ground. Shoulders, hips and knees are on a horizontal line, feel the feeling of hip strength. 3. Anterior thigh muscle stretching training: quadriceps muscle stretching can reduce muscle tension, thus reducing the pressure on the patella of the knee joint and alleviating pain symptoms. Lie down on the bed, slowly bend your knees, move your feet toward your hips, grab your ankles with your hands and slowly approach your hips, keep it for 30 seconds, and do it 3 to 4 times in each group. Exercise methods for patellar instability, specific can consult the professional physician’s opinion.