A jig 10 for repositioning two or more vertebrae 1,2 has a first clamp, a registration unit 100, a kinematic unit 200, a coupling unit 300, and a second clamp. The first clamp (400a, fig 27) is attached to a generally tubular extension 15a of a first anchor screw 12a and defines the position of the registration unit 100. The second clamp (400b, fig 27) is attached to an extension 15b of a second anchor screw 12b and defines the position of the coupling unit 300. The registration unit 100 is attached to the first screw for defining the position of the kinematic unit 200, and the coupling unit 300 connects the kinematic unit 200 to the second screw. The kinematic unit 200 can reposition two or more bones by performing up to three orientated translations and/or one orientated rotation with reference to the registration unit 100. Multiple hinges have slots to receive a protractor (60, figure 6) and various components have a hole to receive a radiopaque angle indicating arm (50).
