a: Lenke 5 curve-24 year old woman. 65 standing goes to 30 on stretch film. Cobb angle on “stretch film” is 30 degrees. Instrumentation will be from T11 to L2. b: decompensation to R is obvious. Lumbar hump obvious. c: decompensation to R is obvious. Lumbar hump obvious. d: correction full and perfect “flat” sagittal plane alignment within the instrumented segment. Interbody cages rarely necessary above L2-3 disc space. However, if they are needed, use them ! Sagittal plane alignment after the surgery is as important as coronal plane correction. BOTH must be perfect post-op.