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At least it's not a hacksaw, but a CUTTING JIG, technology  like something from  Dick Tracy or James Bond.  A plastic  mold is made based on the MRI scan which fiits on the bone, perfectly they say, and is held in place by pins.  The aforementioned cutting jig, a harmless-looking little rectangular thing, is put in place, and then--------these sharp little saw blades come through a slot in the jig to make the cut of the bone.  OMG