An orthopaedic surgical instrument, comprising: an elongated body extending along a longitudinal axis, the elongated body including a distal tip configured to expand and contract relative to the longitudinal axis between an expanded position and a contracted position, a central shaft and a plurality of cantilevered arms that extend outwardly from the central shaft, the plurality of cantilevered arms defining the distal tip of the elongated body, and wherein each cantilevered arm includes a distal flange extending radially outward from the longitudinal axis, a bore extending through the elongated body along the longitudinal axis, characterised in that the surgical instrument further comprises a rod positioned within the bore and moveable along the longitudinal axis, the rod including a distal end configured to selectively engage the distal tip of the elongated body to move the distal tip between the expanded position and the contracted position, and a linkage assembly coupled to a proximal end of the rod, the linkage assembly being moveable between a first position in which the distal end of the rod engages the distal tip of the elongated body and the distal tip is in the expanded position and a second position in which the distal end of the rod is disengaged from the distal tip and the distal tip is in the contracted position, wherein the linkage assembly includes a user-operated lever that extends outwardly from a slot in the elongated body, the lever being rotatable about a pivot axis extending through the elongated body to move the linkage assembly between the first position and the second position, and wherein the linkage assembly includes a link arm having a first end pivotally coupled to the rod and a second end pivotally coupled to the user-operated lever. an elongated body extending along a longitudinal axis, the elongated body including a distal tip configured to expand and contract relative to the longitudinal axis between an expanded position and a contracted position, a central shaft and a plurality of cantilevered arms that extend outwardly from the central shaft, the plurality of cantilevered arms defining the distal tip of the elongated body, and wherein each cantilevered arm includes a distal flange extending radially outward from the longitudinal axis, a bore extending through the elongated body along the longitudinal axis, characterised in that the surgical instrument further comprises a rod positioned within the bore and moveable along the longitudinal axis, the rod including a distal end configured to selectively engage the distal tip of the elongated body to move the distal tip between the expanded position and the contracted position, and a linkage assembly coupled to a proximal end of the rod, the linkage assembly being moveable between a first position in which the distal end of the rod engages the distal tip of the elongated body and the distal tip is in the expanded position and a second position in which the distal end of the rod is disengaged from the distal tip and the distal tip is in the contracted position, wherein the linkage assembly includes a user-operated lever that extends outwardly from a slot in the elongated body, the lever being rotatable about a pivot axis extending through the elongated body to move the linkage assembly between the first position and the second position, and wherein the linkage assembly includes a link arm having a first end pivotally coupled to the rod and a second end pivotally coupled to the user-operated lever.