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Geomagic studio images to evaluate the spatial position between pre- and post-operative images. The pre-operative image of C2 (a) and the post-operative image of C2 (b) are combined to reveal the spatial position between pre- and post-operative data (c). The entry point of the cylinder for C2TLS was marked by a red spot (d), the entry point of screw for C2TLS was marked by a yellow spot (e). The measurement of entry point data from planned to post-operative is shown (f)
