Device for preparing a space between adjacent vertebrae to receive an insert

Apparatus for preparing a space in the spine to receive an insert element or insert between adjacent vertebral bodies, comprising: a handle; a shaft (12) operatively connected to said handle; a mounting member (16) disposed at a distal end of said shaft; a drive mechanism; a power source operatively connected to said drive mechanism; and an abrading element (18; 218; 250) mountable on said mounting member for movement by said drive mechanism; including said abrasive element a first abrasive surface (90; 140; 252) selected to create a predetermined one of the adjacent vertebral bodies, to be displaced said abrasive element by said drive mechanism, and a second abrading surface (92 surface contour; 142; 154), characterized in that said first and second abrading surfaces (90, 92; 140, 142; 252, 254) are rotated in opposite directions by said drive mechanism addresses.