After exclusion of delayed unions and pseudoarthroses in teenagers, the time required for union of 275 consecutive fractures of the femoral diaphysis in children followed a log-normal pattern with a constant 10 percent coefficient of variation and a geometric mean increasing uniformly by 0.7 weeks per year. Multiple injuries increased, and operative treatment reduced the geometric mean time for fracture healing.
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Skak et al. (1988) studied this question.
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