Angular deformities of the lower limbs in children.

Bowlegs and knock-knees are common concerns in the early years of life. For the majority of children, these problems represent normal physiologic development and they correct spontaneously. A few children will have pathologic malalignment, which may lead to functional or cosmetic problems that may require treatment, usually bracing and occasionally surgery. Physiologic varus and valgus and the common causes of pathologic malalignment, including Blount's disease, rickets, hereditary conditions, infection, and trauma are discussed.