There are many causes of finger joint deformation, including non-disease factors such as joint strain and degeneration, as well as disease factors such as trauma, autoimmune diseases, bone tumors, etc. Non-disease factors: middle-aged and elderly people or long-term hand workers, due to joint strain and degeneration, finger osteophytes, commonly known as bone spurs, bone superfluous, can lead to finger joint deformation, accompanied by pain, swelling, limited activity and other clinical symptoms, it is recommended that the diagnosis can be clarified by X-ray examination. Second, the cause of the disease: 1, trauma: the hand is located at the end of the upper limb, can complete many fine movements, when the hand is injured by external forces, or there is a danger of protection through the hand, it is easy to cause joint fractures or dislocation and other injuries, finger joint deformation, swelling, activity restrictions, and even paradoxical activities can occur. Most of the treatment is carried out surgically to restore the continuity of the bone. If the healing is poor after trauma, it can also cause joint deformation; 2. Autoimmune diseases: such as rheumatoid arthritis, may lead to finger joint deformation. Rheumatoid arthritis attacks the synovial tissue, which in turn leads to clinical symptoms of swelling, deformity, and restricted movement of the finger joints. Patients will have obvious morning stiffness for more than one hour; 3. Bone tumors: for example, bone tumors occurring in the finger joints can lead to bone destruction, swelling, deformation, pain, and even pathological fractures, which can be initially analyzed by X-ray, CT, and MRI for fracture types, and eventually need to be clearly diagnosed by pathological biopsy.