The device comprises a parallel sided measuring board 1, on which the patient sits, at one end. The board bears a central ridge 20, to centralise the pelvis and has a back support 11, which may bear two fixed pads 14 to centralise the spine. The back support also bears a pair of vertically adjustable pads 16, which in use are positioned behind the patients dorsal iliac crests, whereby these crests may be accurately aligned at right angles to the axis of the board. The board also bears a longitudinally movable central spacing element 4 to ensure leg alignment and a pair of identical tape measures 19. These are parallel, approximately 20 cm apart and run in recesses along the axis of the board. The tapes are for measuring the positions of the left and right heel and by construction they give identical readings if a line is drawn at right angles across the board.
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