%0 Journal Article %A K Ohzono %A M Saito %A K Takaoka %A K Ono %A S Saito %A T Nishina %A T Kadowaki %T Natural history of nontraumatic avascular necrosis of the femoral head %D 1991 %J The Journal of Bone & Joint Surgery British Volume %P 68-72 %V 73-B %N 1 %R 10.1302/0301-620X.73B1.1991778 %U https://doi.org/10.1302/0301-620X.73B1.1991778 %K