It is more common in females over the age of 50 with possible risk factors of corticosteroid use, Lupus, alcoholism, pancreatitis, sickle cell anemia, and rheumatoid arthritis.
Spontaneous osteonecrosis of the knee
Facet joint arthrosis
Osteoradionecrosis
Post-traumatic arthritis
Calcific bursitis
Retrocalcaneal bursitis
Osteochondritis
Transient synovitis