One month after the patella fracture surgery, it is in the period of primitive bone scab formation, and there is some bone scab formation at the fracture site. The healing of fracture is theoretically divided into hematoma inflammation mechanization period (about 2 weeks), primitive bone scab formation period (about 2~3 months), and bone scab remodeling and shaping period (about 1~2 years), so one month after the fracture surgery is in the period of primitive bone scab formation, at this time there is part of the fracture bone scab formation. One month after the patella fracture surgery, according to the healing of the fracture and the wound healing situation, you can carry out the knee joint extension position under the protection of the brace to go down to the ground for weight-bearing or partial weight-bearing. During the period of bed rest, rehabilitation exercises should be carried out under the guidance of the doctor, mainly for the knee joint and lower limb muscle exercise, which can prevent joint stiffness and lower limb venous thrombosis and other complications.