What is mean by SAG SD?

SAG SD typically refers to "Sagittal Slope of the Sacrum and the Sacral Disc," which are measurements used in spinal analysis, particularly in the context of assessing spinal alignment and health. The sagittal slope indicates the angle of the sacrum in relation to the horizontal plane, impacting overall spinal posture and mechanics. These measurements are important in understanding conditions like scoliOSis or other spinal deformities.