There are many reasons for protruding finger joint bones, which may be caused by long-term hand strain or joint degeneration in older people, or may be caused by the presence of poor healing of trauma, autoimmune diseases, etc.: I. Non-disease factors: Some elderly people or people engaged in long-term physical activities, due to joint degeneration, strain and other factors, resulting in osteophytes in the finger joints, commonly known as bone spurs, bone redundancy. Usually lead to finger joint pain, swelling, restricted activity, finger deformity, the appearance of finger joint bone protrusion, you can conduct X-ray examination to clarify the diagnosis. Second, the causes of disease: 1, trauma healing poor: daily work and life requires the use of hands for operation, easy to bone or soft tissue injury, serious finger joint fractures may occur, if improper treatment, fracture deformity healing, may lead to finger joint bone protrusion; 2, autoimmune disease: when the patient finger joint rheumatoid arthritis and other autoimmune diseases, the joint Synovial tissues are invaded, resulting in clinical symptoms of finger joint pain, swelling, activity restriction, and hyperplasia deformity, which can lead to the protrusion of finger joint bones, which can be clearly diagnosed through laboratory tests and imaging examinations; 3. The initial diagnosis is usually made through X-ray, and eventually a clear diagnosis is needed through CT, MRI and pathological biopsy.