Femoral shaft fracture in 265 children. Log-normal correlation with age of speed of healing.

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.