Bone spurs in the knee may be caused by the human body with age, bone gradually appear aging, degeneration, hyperplasia, may also be caused by obesity, excessive exercise, trauma and other factors. 1. Bone aging, degeneration, hyperplasia: normal aging degeneration of joint cartilage wear and tear with age, bone spurs hyperplasia can increase the stability of the joints, relieve the local pressure increased pressure, patients can be manifested as joint pain, swelling and pain, and climate change related, after resting to alleviate the deformation of the joints of the legs, and even the symptoms of the rotunda leg. 2. Obesity: Because of too much weight, the knee joints are more loaded, and the cartilage of the knee joints is more prone to wear and tear. Patients may have leg pain, even joint redness, swelling, fluid accumulation and deformation. 3. Excessive exercise: due to occupations such as athletes, dancers, and long-term mountain climbing, etc., overuse of the knee joint can also accelerate its wear and tear, and patients may experience pain, joint effusion and other symptoms. 4. Trauma: Knee joint ligament damage caused by trauma leads to instability of the knee joint, osteophytes appear, patients may show joint pain, joint effusion, and even deformity. When persistent pain occurs in the knee joint, one should consult a doctor in time for a clear diagnosis and active treatment.