Abstract: A portable body positioning bed frame assembly having a first frame support reversibly attached to a second frame support. The first frame support has a back frame attached rotatably thereto and the second frame support has a thigh frame attached rotatably thereto, with a linear actuator attached between the second frame support and the thigh frame. A calf frame is attached rotatably to the thigh frame. The linear actuator raises and lowers the thigh frame and the calf frame. The calf frame is hinged to the thigh frame to maintain the calf frame approximately parallel to the second frame support as the thigh frame and calf frame are raised and lowered by the linear actuator. The back frame has a support bar for raising and lowering the back frame and adjustable curvilinear back supports for an adjustable convexity in the back of a user that will maintain the shoulders in an anterior position.