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Vertebrae after mechanical testing. (a) Intersomatic screw (sample 3) without displacement in the bone. (b) Footprint left by the screw (sample 3) when it was embedded by stress shielding. (c) Cage (sample 4) without displacement in the bone. (d) Footprint left by the cage (sample 4) when it was embedded by stress shielding. The green circles indicate the marks caused by the Ti prostheses when embedded due to SS.
