A method for scoliosis analysis using stereophotogrammetry has been developed. The technique involves intra-operative stereophotography using an overhead stereo camera system. Stereophoto pairs are taken at specific stages of spinal instrumentation procedures. In this way the effects of specific instrumentation maneuvers can be studied. Photo pairs are put onto Kodak PhotoCD’s and digitized to provide three-dimensional coordinate position for posterior element bony landmarks. Three-dimensional changes in position occurring after specific stages of surgical instrumentation are compared using a computer program developed for this project. Rotational and translational information is calculated for the entire visualized segment of the spine. Accurate results have been achieved with this technique and verified using appropriate statistical methods.