The Langenskiold Classification of Blount disease uses age and severity of deformity as grading parameters 1.
Classification
Six stage radiographic classification of infantile tibia vara, which is based on changes observed as the child matured:
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stage I: 2-3 years
irregularity of metaphyseal ossification zone
delayed development of a medial portion of the epiphysis
medial metaphysis beaked medially and/or distally
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stage II: 2.5-4 years
sharp depression of physeal line medially
medial beaking
medial part of epiphysis more wedge-shaped and underdeveloped
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stage III: 4-6 years
deepening depression of metaphyseal beak
appearance of "step" in metaphysis
increasing wedging and underdeveloping of the epiphysis
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stage IV: 5-10 years
physis narrows
epiphysis enlarges
increasing depth of “step” in metaphysis
epiphysis occupies depression in the medial metaphysis
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stage V: 9-11 years
bony epiphysis separated into two portions by a clear band
partially double epiphyseal plate
slope to the medial articular surface
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stage VI: 0-13 years
branches of the medial part of physis ossify - medial growth arrest
normal growth of the lateral part