A device for restraining the movement of a body lying over the top surface of a tiltable treatment table comprises a yoke spanning said top surface and being secured at both ends to an accessory-mounting rail running along the side of the table. The yoke includes a channel into which rides a shuttle. An angled support bracket has a vertical leg mounting a padded barrier, and a horizontal plate attached to the shuttle across a slot in the channel. The translation of the barrier, support bracket and shuttle along the channel, and the orientation of the barrier can be adjusted and locked in place by a single knobbed tightening screw. A neck support is secured over a median portion of the yoke. The device may be used by placing one or more of the padded barriers against the shoulders, hips, feet or the head of a patient lying in the Trendelenburg or other tilted position on an operating table in order to prevent gravity-induced shift of the body.