RT Journal Article SR Electronic T1 Spontaneous osteonecrosis of the knee. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1416 OP 1416 VO 33 IS 7 A1 Kim, John Y A1 Finger, David R YR 2006 UL http://www.jrheum.org/content/33/7/1416.abstract AB