However, as important as the success of the operation is to the patient, the postoperative functional exercise is also an important factor in the recovery of the knee. Therefore, it is important for patients to start functional exercises as soon as possible after knee replacement under the guidance of a physician. There are three main types of functional exercises after knee replacement: first, knee extension exercises; second, knee flexion exercises; and third, quadriceps exercises. Complete knee extension exercise The complete knee extension exercise is often referred to as the leg press exercise. Patients can press the knee joint straight in bed, you can put the ankle pad high, so that the knee at the suspension, using the weight of the limb itself to press the knee joint straight; you can also straighten the leg in bed, put the ankle pad high, and put a sandbag in the position of the knee up to press the leg, to assist the exercise, lasting about 30 ~ 40 minutes. The general weight of the sandbag is about two kilograms, and the weight can be increased appropriately for patients with very good physique. Straightening the knee joint is an important factor in ensuring equal length of the legs and reducing joint pressure between the patella and the femur. Knee flexion exercise Knee flexion exercise, mainly refers to leg bending exercises. 1, exercise patients lying on their backs, knees bent, relying on the natural gravity of the lower leg to make the knee joint to obtain as much flexion as possible; 2, active straightening exercises in the flexion position, in the state of knee flexion, active straightening of the knee joint; 3, can also sit on the edge of the bed, legs down, good leg pressure surgery leg to do the pendulum movement; 4, sitting in a chair bending the knee as far back as possible to reach the foot; 5, wait until three weeks after surgery, the patient can also start Try to squat slowly holding on to other objects to exercise knee flexion mobility. Although you can’t achieve a high degree of flexion with your thighs against your calves through rehabilitation, you can basically achieve 120 degrees of flexion after an artificial knee replacement. TIPS: If the flexion flexibility reaches 60°, you can walk on a flat road with no effect; if the flexion flexibility reaches 90°, you can put on and take off shoes and socks and jog with no effect; if the flexion flexibility reaches 110°, you can go up and down steps of normal height with no effect; if the flexion flexibility reaches 120°, you can squat with no effect. Quadriceps Exercise Quadriceps exercise, which is a single leg extension and elevation exercise, is a very important rehabilitation program after artificial knee arthroplasty. Patients can sit on a stool or on the side of the bed to train, insist on 5-10 seconds each time, then relax for 10 seconds and continue the training. If both sides are diseased, the legs can be alternated, but not at the same time. 20-40 times daily in the morning and afternoon. With quadriceps exercises, patients tend to get better muscle strength and joint mobility, and more importantly, good strength in the knee joint and improved gait. TIPS: The number of exercises for straight leg lifts may vary slightly depending on the individual’s condition, and the doctor will recommend the number of exercises through evaluation.