Four months after the comminuted fracture of the patella, the fracture is only basically healed, but also need some time to recover, so can not do heavy work, generally about 2 years can do heavy work. Most of the comminuted patella fracture is caused by fall, car accident, etc. After the fracture, the stability of the knee joint decreases and the activities are limited. Patella fracture 3~6 months in the bone scab formation period, although the fracture has basically healed, can walk on the ground, some relatively light activities, but at this time the strength of the fracture site is still not as strong as before the fracture. It also needs to go through the period of bone scab transformation and shaping, which usually takes about 2 years, and if you do heavy exercise during this period, it may lead to secondary injury of the fracture end. Post-operative activities for comminuted patella fracture are recommended under the guidance of a physician.