The most common cause of osteoarthritis is degenerative changes of the bone and joint, the main reasons are as follows: 1, age: joint degeneration increases with age; 2, obesity: obesity leads to increased weight-bearing load on the joints, the body’s hormone secretion imbalance, joint degeneration increases; 3, genetic factors: osteoarthritis exists in family aggregation. Joint injury is the main cause of secondary arthritis, prone to the formation of femoral head necrosis, hip osteoarthritis, knee ligament damage, the formation of degenerative changes. Inflammation can lead to further damage to the joint and the formation of osteoarthritis.