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Radiographic measurement of the actual tibial length. Actual length of the tibia is calculated as L2 – (D2 – D1) and the amount of physeal growth is calculated as (L2 – L1) – (D2 – D1) where D1 is the distance between the middle half pins before distraction, D2 is the distance between the middle half pins after distraction, L1 is the length of the tibia before distraction, and L2 is the length of the tibia after distraction.
