而目前,最常用的是ARCO(Association Research Circulation Osseous)分级:0期,X线片、CT扫描、MRI、ECT均正常,只有股骨头的病理学检查才能发现异常;I期,X线片、CT扫描正常,MRI及ECT可有异常改变,股骨头变形正常而病理学明显改变;Ⅱ期,X线片、CT、MRI、ECT均可发现异常,股骨头外形正常,形态仍无改变。病理学改变进一步发展;Ⅲ期,X线片显示股骨头有塌陷,半月征出现,股骨头外形基本正常;Ⅳ期,X线片显示股骨头外形明显改变,塌陷变平,关节间隙尚在;V期,股骨头变形明显,关节间隙变窄。
1.Bernard NS. Osteonecrosis: What to do, what to do![J].The Journal of Arthroplasty.
2.T Kubo,K Ueshima,M Saito.Clinical and basic research on steroid-induced osteonecrosis of the femoral head in Japan[J].Journal of Orthopaedic Science.
3.Huijuan Cao, Hanfeng Guan, Yuxiao Lai.Review of various treatment options and potential therapies for osteonecrosis of the femoral head[J].https://doi.org/10.1016/j.jot.2015.09.005