A spinal fusion interbody spacer device has a solid central core positioned between laterally opening opposed concave side surfaces. The device includes spaced apart superior and inferior abutment surfaces which are convexly arced. The spacer device is implanted between a pair of adjacent vertebrae by insertion in a tipped-over orientation and then reoriented to an upright orientation for engagement of the abutment surfaces by facing surfaces of the vertebrae.

 
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> Controlled artificial intervertebral disc implant

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