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Therapeutic knee-ankle-foot orthoses (KAFO) designed for external modification of the structural and/or functional characteristics of the knee and ankle joints and foot of infants (typically before three years of age) with bowed legs. These orthoses use frames and provide support and permit a limited range of movement to the joints. These orthoses typically include a rigid frame structure with the shape of a letter A (known as A-frames), they usually include a foot plate, a medial metal upright bar, an orthotic knee (e.g., locked or drop-lock) joint, and thigh straps. A-frames orthoses used for treatment of infant bowleg are intended for infants with moderate progressive bowing disorder due to abnormal grow of the tibia (known as tibia vara or Blount disease).
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