Abstract: Chiropractic aids for releasing tension in the muscle groups that act to form anteroposterior curvature in the lumbosacral region. Usable with wedge-shaped pads and a rectangular pillow, the principal aid is a convertible triangular pillow having two right-triangular members detachably hinged along their right-angle corners by a first surface fastener. A second surface fastener is provided on each right-triangular cylindrical member edgewise opposite the right-angle corner. Thus the surfaces defined by the counterpart short sides of the right-triangular cylindrical members can be detachably fastened together by the fasteners.