35 calluses formed during limb lengthening were classified radiographically into 6 types: external, straight, attenuated, opposite, pillar, and agenetic. The healing indexes correlated well to the intrinsic periosteal and endosteal conditions of each type. This classification enabled us to estimate the intrinsic conditions, predict the healing index, control the daily lengthening speed, and decide to apply early augmentation of the callus.
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Hamanishi et al. (1992) studied this question.
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