Incomplete treatment of patellar fracture may lead to the development of sequelae such as peripatellar pain, degenerative osteoarthritis, patellar deformity, and limited knee motion. As the largest seed bone in the human body, the patella has an important biomechanical function that protects the knee joint, participates in the composition of the knee-extension device, and increases the knee joint’s ability to slew. When the knee fracture is not well treated and recovered, it may lead to knee pain when cold, uneven patellar articular surface or osteophytes which may lead to deformity of the patella, limitation of activities such as straightening or flexion of the knee, degenerative osteoarthritis and other sequelae.