A system for turning a person from a supine position to a prone position and vice versa includes opposing patient support platens each coupled to a corresponding end of a first and a second COG assembly, the first and second COG assemblies each coupled to a corresponding one of a pair of spindles, each one of the spindles disposed on a corresponding lift column. Embodiments described herein provide for an axis of rotation that is adjustable with respect to the plane of either an upper or lower support platen. Embodiments provide for adjusting the separation distance between the axis of rotation and the center of gravity defined by the combination of the person and the supporting platens.
