Reliability of the metaphyseal-diaphyseal angle in tibia vara as measured on digital images by pediatric orthopaedic surgeons.

Background: Levine and Drennan described the tibial metaphyseal-diaphyseal angle (MDA) in an attempt to identify patients with infantile Blount's disease. Pediatric orthopaedic surgeons have debated not only the use, but also the reliability of this measure. Two techniques have been described to measure the MDA.