Which condition involves avascular necrosis of the medial tibial condyle leading to leg bowing in children?

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This question centers on a growth disturbance of the proximal tibia in a child that produces bowing due to loss of blood supply to the medial side of the tibial physis. Blount disease causes avascular necrosis of the medial proximal tibial physis/condyle, leading to arrested growth on the medial side and progressive tibia vara (bowing) during childhood. Clinically, you’d see a bow-legged appearance that may worsen with weight bearing, and radiographs often show varus deformity with medial metaphyseal irregularities or beaking, sometimes described in progressive Langenskiöld stages. The key idea is that the deformity stems from impaired growth at the medial proximal tibia, not from a soft-tissue overuse issue or a problem at another bone. Other conditions listed involve different sites or processes (such as tibial tubercle traction issues or vertebral osteonecrosis) and do not explain the combination of avascular necrosis of the medial tibial condyle with leg bowing in children.