Sagittal Radiographic Parameters of the Spine in Three Physiological Postures Characterized Using a Slot Scanner and Their Potential Implications on Spinal Weight-Bearing Properties.

Study Design: Prospective radiographic comparative study.

Purpose: To compare and understand the load-bearing properties of each functional spinal unit (FSU) using three commonly assumed, physiological, spinal postures, namely, the flexed (slump sitting), erect (standing) and extended (backward bending) postures.

Overview Of Literature: Sagittal spinal alignment is posture-dependent and influences the load-bearing properties of the spine.