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Pre-operative trialling of device sizes using a dynamic biomodel, shown in the C6–C7 interbody space (A and B). (A) 15 mm wide device, (B) 17 mm wide device; (C) sagittal plane X-ray of a physical 3DP biomodel (C5 and C6) used to test the fit of a cervical patient specific implant. X-ray allows screw trajectory and screw length to be assessed—in this case longer screws could safely be used.
