In summarizing three years' experience in the treatment of structural scoliosis of unknown cause, it has seemed best to begin with a short discussion of scoliosis in general, and of the theory and practice of its treatment, in order to make clear the gardations which finally led to the introduction of the operation. It must be understood that the experiences on which these remarks are based are, with one exception, those of hospital practice. If the subject of scoliosis appears to be taken seriously, it is because the cases I have seen are serious and are so regarded by the patients themselves.
Among the most discouraging subjects with which orthopedic surgeons have to deal is rotary lateral curvature of the spine. It is not necessary in an article of this character to make an exhaustive catalogue of its well known causes. The most common and important are various diseases of