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Other conditions, such as rheumatoid arthritis (a chronic inflammatory disease that causes joint pain, stiffness, and swelling), avascular necrosis (loss of bone caused by insufficient blood supply), injury, and bone tumors also may lead to breakdown of the hip joint and the need for hip replacement surgery.
Osteoarthritis may cause hip cysts. Hip cysts are usually detected on X-rays that are taken for other medical reasons. Trauma or injury to the hip may cause a hip cyst to form. Synovial cysts in the hip are often caused by rheumatoid arthritis.