Abstract: A cushion having multiple pneumatic cells extending upward from a common impermeable base is directly attached to a flat rigid base which is fixedly attached to each of three subframes of a convalescent recliner. Male and female snap fasteners are suggested. The direct attachment of the cushion to the flat rigid base disposes the bottom of the common impermeable base flush with the top of the flat rigid base. Upper attachment elements are located upon the bottom of the common impermeable base which mate with lower attachment elements located upon the top of the flat rigid base. Both upper and lower attachment elements are located in a single fixed configuration. An absorbent elastic cover fits over the cushion, is readily removable, and has a hem which fits about the periphery of the bottom of the cushion, outside of the fixed configuration of upper fastening elements. An ischemic preventive support cushion which will not shift as a result of inclination is provided.