The pre-operative coronal wedge angle for both the vertebra (green) and intervertebral discs (yellow), shown cumulatively for each patient. Note the sum of the vertebra and intervertebral disc wedge angles for all spinal levels in a particular patient gives the overall pre-operative coronal Cobb angle (Major Cobb angle shown above the bar). Note also that negative wedge angles mean the disc or vertebra was wedged in the opposite direction to that of the major curve.
Little et al. Scoliosis 2013 8:9 doi:10.1186/1748-7161-8-9