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Schematic of the custom designed flexion-compression test set-up. The lower metal cup was firmly attached to the materials testing machine. The spinal segment was fixated by means of PMMA to the lower and upper metal cup. A roller was mounted on the vertical actuator of the materials testing machine and was forced to traverse the slot in the upper cup introducing a flexion movement of the spine. A counter balance mechanism was applied to return the spinal segment to its neutral position
