Abstract: A therapeutic devise consisting of a wedge shaped base with sloping quadrilateral elevation contacting the sacrum and overlapping the iliac bones at the sacroiliac joint. The top surface of the base is concave bilaterally to comfortably accommodate the buttocks of the user. A sacral attachment is placed on top of the central quadrilateral elevation of the base, itself consisting of four smaller rhomboid elevations that contact each inferior lateral angle of the sacrum and overlapping each sacroiliac joint near the sacral base. The overlapping of the sacroiliac joint acts to bias the sacrum to remain square within the pelvis. The overall slope of the base is maintained in the sacral attachment and acts to simultaneously reduce lumbar lordosis.