Intramedullary bone groover

A tool for grooving the inside wall of a hole in intramedullary bone, comprising a housing having a central axis and elongated along its central axis and having a circular cross-sectional shape when viewing a section through a plane perpendicular to said central axis, a cannulated shank at one end of the housing, the shank being connectable to and rotatable by rotary power means, a pair of cutter means each comprising at least one cutting edge, means mounting said cutter means in the housing for opposite movement radially of said axis to project said cutting edges beyond the housing sufficiently for grooving said inside wall, and to retract said cutting edges sufficiently to permit insertion of the tool into said hole and withdrawing it therefrom, an elongated control means extending through the cannulation of the shank, and means coupling the control means to the cutter means to cause the cutter means to move radially outwardly when the control means moves lengthwise of the tool in one direction and to move radially inwardly when the control means moves lengthwise of the tool in a direction opposite to said one direction.