The essential characteristics of the deformity observed in scoliosis have been understood for more than a hundred years. The voluminous literature of scoliosis deals largely with the cause or causes of the deformity, but mainly with the thousand and one methods which have been used in its treatment, with only a few serious studies of the mechanics involved. The striking similarity in the deformities resulting from such a variety of well established causes indicates a uniformity in the intermediate causes, that is, in the mechanics of the deformity. The purpose of this paper is to analyze the previous explanations of this mechanism and to add the results of some original investigations on mechanical models.
The spine is a segmented rod. Each segment consists of a body and a neural arch. The column of bodies is the weight-bearing element. weight bearing including the pressure stresses of all the muscles