Radiographic Evaluation of Scoliosis

Serial evaluation of scoliosis relies on measurement of curvature on radiographs. Progression or improvement is based solely on the assumption that the radiograph gives a true picture of the configuration of the spine in the AP projection, and that patient position remains constant with serial radiographs. Slight rotation of the patient allows the kyphosis or lordosis normally present in the spine to either increase or decrease the measured scoliosis curve, depending on the direction of rotation. Reliance on technician positioning of the patient introduces a random error of such a magnitude as to make serial evaluations invalid. The use of the Scoliosis Chariot as a positioning device guarantees reproducibility of patient position, thus eliminating the problem of random error.