“…27 Classification systems for ONFH diagnosis. A modified version of "Harris Hip Score" named "Children's Hospital Oakland Hip Evaluation Scale -CHOHES" was developed and validated by Freitas et al 28 Freitas et al 28 evaluate signs and symptoms and functionality status of sickle cell related ONFH. Other classification systems used for the diagnosis and staging of ONFH based on radiographs and MRI)include Steinberg or (University of Pennsylvania), Japanese Investigation Committee, Ficat and Arlet and Association Research Circulation Osseous.…”