A Scoliosis double major curve is defined as two lateral curvatures (Scoliosis) in the same spine.
Double major curve describes a Scoliosis in which there are two structural curves which are usually of equal size. Double thoracic curve a Scoliosis with a structural upper thoracic curve, as well as a larger, more deforming lower thoracic curve, and a relatively nonstructural lumbar curve.
For type 3DM curves, the general rule is to fuse both the MT and TL/L regions posteriorly. The upper end vertebra is usually T3, T4, or T5, and the lower instrumented vertebra is usually L3 or L4. Most of these curve patterns will be type 3C, indicating complete translation of the apex of the lumbar spine off the midline. Rarely, for a type 3CN curve in which the thoracic surve is the major curve and much more structural in its radiographic parameters, a selective thoracic fusion can be performed. Typically, both thoracic and lumbar curves will need to be included in the instrumentation and fusion.
Scoliosis Double Major Curve