has material basis in germline mutation in COL2A1 familial avascular necrosis of femoral head avascular necrosis of femoral head, primary, 1 https://github.com/monarch-initiative/mondo/issues/4521 https://github.com/monarch-initiative/mondo/issues/4948 https://www.malacards.org/card/avascular_necrosis_of_femoral_head_primary_1 UMLS:C4551562 MEDGEN:1639295 ischemic necrosis of femoral head avascular necrosis of femoral head, primary, 1 MONDO:0054550 osteonecrosis of femoral head GARD:0025946 avascular necrosis of the femoral head ischaemic necrosis of femoral head ANFH1 Femoral head, avascular necrosis of OMIM:608805 femoral head, aseptic necrosis of dysplasia of the proximal femoral epiphyses