The common causes of pain in the knee bone are as follows: 1. cold, if cold or cold stimulation for a long time can easily lead to the occurrence of local synovitis, resulting in pain. 2. strain, prolonged heavy physical activity can easily damage local muscles and bones leading to cartilage wear. 3. traumatic stimulation leading to muscle and bone destruction and pain. 4. degenerative osteoarthritis, mainly seen in elderly or If the pain is accompanied by swelling, X-ray examination is required, and if the joint deformation is obvious, further surgery is needed to relieve the pain. 5. Rheumatoid arthritis can lead to local synovial hyperplasia and pain.