Some people find that their arms are bent after straightening, and that there is no way to straighten them completely, mainly due to various reasons for elbow joint straightening dysfunction. When suffering from the following diseases, it may lead to elbow joint straightening disorder: 1. The most common is elbow joint osteoarthritis, when the elbow joint under the action of long-term acute and chronic injury factors will produce osteoarthritis. Once osteoarthritis is produced, the joint function will be severely restricted, especially the straightening function is the most obvious, so there is no way to straighten. 2. The lack of straightening of the arm may also be due to a fracture in a part of the elbow joint, which is not systematically exercised after the fracture, so the joint function is severely restricted and there is no way to straighten.