"In school children's orthopaedic clinics one of the authors saw many primary school children with symptoms arising from lumbar dysfunctions. In most of these, a parent would remember an injury when specifically asked, but the history had to be searched for before it was mentioned. Unless they are treated, by the time these children have reached adulthood, the compensatory asymmetries will almost certainly have become fixed and themselves require treatment."
Bourdillon JE, Day EA, Bookhout MR: Spinal Manipulationn, 5th edition. Oxford, England, Butterworth-Heinemann Ltd, 1992.