Which condition is marked by inward bowing of the lower leg that progresses over time?

Blount's Disease is characterized by the inward bowing of the lower leg, specifically affecting the tibia. This condition typically develops during childhood and can progress over time if left untreated. The progression of the bowing occurs as a result of abnormal growth and development at the growth plates, particularly at the knee joint, which leads to an unequal distribution of forces across the bone. As the child grows, this can become more pronounced, causing noticeable deformity and altering the biomechanics of walking and running.

Intervening in Blount's Disease can be crucial. Early detection may lead to conservative measures, such as bracing, to correct or limit the bowing. In more severe or persistent cases, surgical intervention may be necessary to realign the bones and improve function.

In contrast, other conditions listed, such as Leg-Calve-Perthes Disease, Scheuermann's Disease, and Avascular Necrosis, involve different pathological mechanisms and do not specifically lead to the characteristic progressive bowing of the lower leg seen in Blount's Disease. Leg-Calve-Perthes Disease primarily affects the hip and involves avascular necrosis of the femoral head. Scheuermann's Disease is a spinal condition that leads to kyphosis in adolescence