Avascular necrosis of the metatarsal head is known as which condition?

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Avascular necrosis of a metatarsal head is known as Freiberg disease. It typically affects the second metatarsal head in adolescents, arising when blood supply to that part of the bone is disrupted, leading to osteonecrosis, flattening of the articular surface, and pain with forefoot use. Clinically you’ll notice activity-related forefoot pain with focal tenderness at the affected metatarsal head, and radiographs may show central depression or flattening of the metatarsal head, with possible joint incongruity in later stages. Treatment depends on the stage, ranging from rest and activity modification to surgical options like debridement or osteotomy in more advanced cases. The other conditions listed involve different bones or mechanisms (Kummel disease is vertebral AVN, Blount disease is tibial bowing, Osgood-Schlatter is traction apophysitis of the tibial tubercle).