The common causes of joint deformation include rheumatoid arthritis, osteoarthritis, knee inversion, etc., which require general treatment, medication and surgery. 1. Rheumatoid arthritis: in the acute stage, bed rest should be provided, and appropriate exercise can be performed after the symptoms are relieved; non-steroidal anti-inflammatory drugs such as ibuprofen and immunosuppressants such as cyclophosphamide can be taken orally; for those who are not effective in conservative treatment, arthroscopic subluxation, arthroplasty or artificial joint replacement can be chosen. 2. Large bone joint disease: early use of vitamin A can control the development of lesions; for advanced patients with severe deformity and dysfunction, surgical treatment, such as orthopedic or joint replacement is feasible. 3. Knee inversion: use arch support pads or orthopedic shoes for children under 3 years old; for those who are ineffective in conservative treatment, model resection, transection, etc. can be chosen as appropriate. It is recommended that people with joint deformity go to regular hospitals in time to clarify the cause of the disease and standardize the treatment under the guidance of doctors.