Osteonecrosis is a condition in which bone dies due to a decrease or complete shutoff of the blood supply to that bone. Osteonecrosis can occur in any bone; however, it is most prevalent in the hip.
When osteonecrosis occurs in the hip, the blood supply to the femoral head of the hip is compromised, causing the femoral head to die and collapse. Over time, this collapse can develop into arthritis. Symptoms include hip pain, difficulty transitioning from sitting to a standing position, pain with weight-bearing, and increased pain with motion of the hip. Symptoms typically worsen over months to one year.
The cause of osteonecrosis is unknown.
Surgical options include core decompression and total hip replacement, followed by physical therapy for strengthening and range of motion.