Axial and hip bone mineral density and radiographic changes of osteoarthritis of the knee: data from the Baltimore Longitudinal Study of Aging. - Lethbridge-Cejku,M.; Tobin,J.D.; Scott,W.W.; Reichle,R.; Roy,T.A.; Plato,C.C.; Hochberg,M.C. (J Rheumatol, 1996)