According to the American Academy of Orthopaedic Surgeons, more than 193,000 total hip replacements are performed each year in the United States and more than 90 percent of these do not require revision.
New technology and advances in surgical techniques have greatly reduced the risks involved with hip replacements.
The most common problem that may arise soon after hip replacement surgery is hip dislocation. Because the artificial ball and socket are smaller than the normal ones, the ball can become dislodged from the socket if the hip is placed in certain positions. The most dangerous position usually is pulling the knees up to the chest.
The most common later complication of hip replacement surgery is an inflammatory reaction to tiny particles that gradually wear off of the artificial joint surfaces and are absorbed by the surrounding tissues. The inflammation may trigger the action of special cells that eat away some of the bone, causing the implant to loosen. To treat this complication, the doctor may use anti-inflammatory medications or recommend revision surgery (replacement of an artificial joint). Medical scientists are experimenting with new materials that last longer and cause less inflammation.
Less common complications of hip replacement surgery include infection, blood clots, and heterotopic bone formation (bone growth beyond the normal edges of bone). Studies are also looking at the use of bisphosphonates, ciprofloxacin, pentoxifylline, and other medications to prevent this bone resorption around the implants.
The National Institute of Arthritis and Musculoskeletal and Skin Diseases supports research into the causes, treatment, and prevention of arthritis and musculoskeletal and skin diseases.