It usually takes 3-6 months after surgery for the tightness of comminuted patella fracture to disappear, and the tightness usually originates from the damage to the joint or local tissue adhesion during the surgery. The resolution of tightness depends on the degree of fracture of the patella, postoperative care, and the patient’s own recovery. The tightness after fracture usually depends on the severity and scope of involvement, because the patella is located in the knee joint, which is easy to affect the function of the joint, and there will be obvious tightness at the joint, so it will take 3~6 months for the tightness to disappear after comminuted fracture of the patella. Patients with comminuted fracture of the patella should carry out active rehabilitation training after surgery, and should carry out isometric contraction exercise of quadriceps muscle and knee joint activities under the guidance of doctors to prevent muscle atrophy and joint adhesion, promote local blood circulation, and also relieve the feeling of tightness to a certain extent.