Avascular Necrosis of Femoral Head, Primary, 1, also known as ischemic necrosis of femoral head, is related to avascular necrosis of femoral head, primary, 2 and familial avascular necrosis of femoral head. An important gene associated with Avascular Necrosis of Femoral Head, Primary, 1 is COL2A1 (Collagen Type II Alpha 1 Chain). The drugs Rivaroxaban and Heparin, bovine have been mentioned in the context of this disorder. Affiliated tissues include Adipose, bone and bone marrow, and related phenotypes are avascular necrosis of the capital femoral epiphysis and hip pain