Abstract: A bone-cutting surgical implement, commonly called a rongeur, has a pistol-like grip with a finger controlled lever in pivotal engagement with the handle. Extending from the handle is a rod defining an upward facing, longitudinal keyway. The rod also has an upwardly angularly protruding jaw facing backward along the rod. A second rod is in slidable engagement with the first rod by a key disposed in the keyway. The arrangement constrains the slidable rod to rectilinear motion along the first rod. At an extremity of the slidable rod proximal to the handle, the slidable rod is pivotally connected to the lever. By moving the lever an operator is able to move the slidable rod along the fixed rod. A replaceable, disposable jaw is releasably coupled to a distal extremity of the slidable rod and faces the end jaw of the first rod. The replaceable jaw is also guided by the keyway defined by the first rod.