There is a difference between tear and rupture of the medial patellar support band, the difference includes different imaging examination, different degree of injury, different treatment modalities, etc., as follows: 1. Imaging examination: MRI is usually performed. Tear of the medial patellar support band is characterized by increased local signals and incomplete interruption of signal continuity, while rupture is characterized by complete interruption of signals in the medial patellar support band. 2. Degree of injury: Tear indicates that the support band is not completely broken, and the degree of injury is relatively mild, while fracture indicates that the support band is completely broken, and the stability of the knee joint is affected, which may be combined with patellar dislocation, and the degree of injury is serious. 3. Treatment: the lesser degree of tearing is usually treated conservatively by wearing a knee brace or immobilizing the knee joint, while the medial patellar support band rupture is usually combined with patellar dislocation, and the support band should be repaired, and at the same time, the patella should be reset to avoid re-injury. It is recommended to go to the regular hospital as soon as possible when the medial patellar support band injury occurs, so as not to delay the diagnosis and treatment of the disease.