The growth plate near the end of bones, from which the new bone cells develop. The growth plates fuse in adulthood.

Growth plates

Children’s bones face the same propensity for injury and fracture as adults though the bones of children have are viewed in a very different manner as they are still dynamic with growth until sometime between 15-18 years of age when the physis or “growth plate” fuses and their injury approaches that of their adult counterparts.