A medical apparatus for use with an outrigger and at least one fastening pin to reposition first and second portions of a bone of a mammalian body. The apparatus includes a framework and a first fastening assembly for coupling the framework to the outrigger and thus the at least one fastening pin and the first end portion of the bone. The first end portion of an elongate pin is provided with a sharpened tip for penetrating the second portion of the bone. A second fastening assembly couples the second end portion of the elongate pin to the framework. At least one adjustment assembly is carried by at least one of the framework and the first and second fastening assemblies for moving the first end portion of the elongate pin relative to the outrigger so as to reposition the second portion of the bone relative to the first portion of the bone. A method for using the apparatus is provided.