Abstract: Apparatus and methods are disclosed for determining and placing a first bony segment in relation with a second bony segment, both segments belonging to the same bone, including cutting said bone partially, to separate it into the first and second bony segment. The two bony segments are linked together by a bony hinge and placing the two boney segments in relation to each other may include distracting both bony segments around said hinge. The hinge may be configured to allow distraction of both bony segments around a single degree of freedom of the hinge and accommodate corrections in two substantially orthogonal planes.