Do osteoarthritis actually is the sciatic tuberosity bursa, located in the deep surface of the gluteus maximus muscle, bursitis is common in the elderly, especially long-term sitting and hard seat, continuous friction or stimulation of the bursa to increase the thickening of the bursa, and its onset of occupation-related, so it is also known as the preparation of workers into the buttocks or tailor buttocks. Inflammation of the patient can not sit for a long time, gluteal muscle contraction can produce pain and radiate to the hip flexion of the hip joint, in the sciatica can be touched to the pigeon egg size of the lump, there is pressure and pain, and fluctuating sensation, but with the following tissues are fixed together, can not be active. If the bursa enlargement obviously can stimulate the sciatic nerve trunk, and the sciatic nerve pain symptoms, should be differentiated from the pyriformis syndrome and lumbar disc herniation, and the elderly hip is good for synovial sarcoma, so it should be differentiated. In terms of treatment, if the bursa is small, it should be treated conservatively with physiotherapy and hot compresses, etc. If the bursa is large, it can be punctured locally, and the synovial fluid can be extracted and injected with prednisolone, and the bursa can be resected if the enlargement is obvious.