Two months after partial meniscectomy, the knee can not be bent, the common reason is due to the lack of postoperative functional exercise, resulting in adhesion of the muscles around the knee joint, knee joint stiffness and so on. 1. Insufficient postoperative functional exercise: due to the postoperative patients did not timely functional exercise of the knee joint, resulting in knee muscles, ligaments, spasm and atrophy, and the knee joint can not be bent. 2. Adhesion of muscles around the knee joint: after arthroscopy, the oozing and edema of the surrounding muscle tissues cause the microcirculation around the knee joint to weaken and the blood supply to decrease, and the edema is aggravated, and the soft tissues of the muscles are prone to adherence after the disappearance of the edema. 3. Knee stiffness: it may be due to the postoperative pain, the patient did not perform timely functional exercise, knee flexion and extension movements, and muscle ligament atrophy, so the knee joint range of motion is reduced, and produce extension dysfunction. This kind of situation can be given local physical therapy and hot compresses to promote blood circulation, do more knee flexion and extension exercises, and gradually increase the range of motion of the knee joint. If you have any of the above conditions, it is recommended that you seek professional medical advice to avoid delays.