1, long-term joint strain Chronic strain such as joint overload is the most common cause of joint degeneration, long-term joint surface to bear excessive load such as long-term heavy lifting so that the hip and knee strain, or the joint to bear little but very harmful stresses such as shear stress, also easily lead to cartilage wear degeneration. 2, acute injury to the joint including acute trauma intra-articular fractures, dislocations such as femoral head fractures, tibial plateau fractures, etc., fractures are difficult to completely reset or poorly reset, resulting in joint surface asymmetry and joint deformity can cause malfunction of the cartilage proliferation repair, degenerative joint degeneration, joint surface deformity such as the hip joint can be dislocated due to slipped epiphysis, in the knee joint occurs knee internal and external rotation, can make the stress convey abnormal, can also make joint damage. 3, congenital diseases lost in treatment congenital hip dislocation, knee inversion and valgus (rotundity), these deformities, on the one hand, make the body lose the normal load force line, excessive stress on the joint, resulting in early degeneration of the joint; on the other hand, the joint cartilage also lost the normal joint coverage and nutrition, resulting in early degeneration of articular cartilage. 4, excessive weight A study of a group of middle-aged women showed that the risk of osteoarthritis in both knees was 18 times higher in obese people than in ordinary women! And suffer from osteoarthritis in middle-aged women, 65% may be caused by obesity. 5, incorrect physical exercise For the elderly, the age factor would have made the joint chronic degeneration, if the inappropriate physical exercise will aggravate the joint damage, such as long-term climbing, climbing stairs are not suitable for exercise. Some studies have shown that in these climbing, running sports, the action on the hip joint to bear the stress is 10 times the weight, while the usual walking hip stress is 3 to 5 times the weight. 6, improper treatment of other bone and joint diseases such as rheumatoid arthropathy, psoriatic arthritis, metabolic disorders, etc., if the treatment is unfavorable, etc. is also a common cause of local joint degeneration, osteoarthritis formation.