It takes at least 3 months after patella fracture surgery to run, and the lower limbs as well as the activity function of the knee joint can only be run after it has completely recovered to normal, which must be decided according to the healing situation of the fracture and the patient’s own recovery. After 4-6 weeks after the fracture, you can start the functional exercise of the knee joint. If the patella fracture does not affect the joint too seriously at that time, the functional exercise of the knee joint for about 2 months, the flexion and extension of the knee joint will be completely restored, and the strength of the muscles of the lower limb will be normalized, and running will be possible. However, if the joint flexion and extension are inflexible or the muscles of the lower limbs are disused and atrophied, running may lead to loss of balance or weakness of the limbs and fall, which may lead to another fracture if serious, so running can only be done after the surgery when the function is fully exercised.