The Journal of Pediatric Orthopaedics published research regarding review of lower extremity radiographs in children.  At 1-2 years old, the legs are frequently in a varus position at the distal femur.  At three years of age, the limbs tended to switch to a slight valgus alignment at the posterior tibia.  By seven years of age, the reference angles were the same as in adult lower limbs.

Reference:  Sabharwal, Sanjeev MD; Zhao, Caixia MD; Edgar, Michele PA-C   (2008) Lower Limb Alignment in Children: Reference Values Based on a Full-Length Standing Radiograph Journal of Pediatric Orthopaedics. 28(7):740-746, November 2008.

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