Abstract

Osteonecrosis is a disease of unknown origin which degenerates the structure of the joint and causes progressive loss of function. While osteonecrosis mostly affects hip joint,it is a pathologic condition which is rarely seen in knee joint.The most frequent type of knee osteonecrosis is idiopathic osteonecrosis(spontaneous). Spontaneous osteonecrosis is more common in patients older than 60 years. In this case report, a 39-year-old female patient diagnosed as having spontaneous osteonecrosis of the knee after a sudden pain was presented.

Key words: knee pain, osteonecrosis, spontaneous, Tibial plateau