Results: Total 33 bone necrosis were found in 17 patients, which involved 31 bones, 20 lesions in femoral head, 7 in the distal part of femora, 4 in the proximal part of tibia and 2 in knee.

• 结果:继发骨坏死者17例,31个骨骼受累,共33个病灶。股骨头20个,股骨下端7个,胫骨上端4个,髌骨2个。