Abstract: A therapeutic appliance is provided for application to the lumbar spine so as to overly the sacrum and sacroiliac joints. The therapeutic appliance is formed basically by an air bladder having a plurality of air chambers. The air chambers include a central air chamber elongated in a direction transverse to a longitudinal direction of the air bladder, and inclined air chambers provided on opposing sides of the transverse air chamber and elongated in directions inclined relative to the transverse air chamber downwardly and toward the respective longitudinal ends of air bladder. Gap air chambers are also provided in the gaps formed between the transverse air chamber and the innermost inclined air chambers. Longitudinally extending air chambers are provided at opposing longitudinal ends of the air bladder.