Osteonecrosis of the Femoral Head Based on the Ficat and Arlet Classification: A Literature Review Cici Enjelia N1*, Naufaldy Rifqiaulia N2, Yusuf Muhammad Reza3, Ira Safitri4, T. Nanta Aulia5 Abstract Osteonecrosis is a degenerative bone condition characterized by the death of cellular bone components due to disruption of the subchondral