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Vertebrae after mechanical testing, with blue circles highlighting the mark left by the SI. (a) Intersomatic screw (sample 9) footprint. (b) Intersomatic screw (sample 7) footprint: the screw was embedded by stress shielding. (c) Cage (sample 8) footprint. (d) Intersomatic screw (sample 6) footprint: the screw was embedded by stress shielding.
