It takes about 1.5-2 months for the patellar fracture bone scabs to begin to form and become visible on imaging x-rays. The healing of patellar fracture needs to go through 3 processes: 1. hematoma formation mechanization period, which is within 0.5-3 months after the fracture, due to the obvious bleeding and edema after the fracture, fluid accumulation in the joint, with the extension of time, fibroblasts grow and gradually become the earliest form of bone scab. 2. primitive bone scab formation period, which lasts about 2-3 months, the better the blood flow the earlier the formation of bone scab, but it takes 1.5-2 It takes 1.5-2 months for the formation of the scab to become evident on the imaging, and after the formation of the scab, the fracture end becomes relatively stable and can be gradually exercised functionally. 3. The scab-forming and shaping period, which lasts 3-6 months, mainly involves alternating activities between osteoblasts and osteoclasts to maintain the stability of the scab and repair the non-functional scab, but this period does not affect normal activities. However, this phase does not affect normal activities.