| http://www.w3.org/ns/prov#value | - An interbody fusion spacer, comprising:a body having an outer surface and a height approximating the height of a human disc space, said body composed of a porous, biocompatible ceramic material for permitting tissue ingrowth therethrough; and a reinforcing sleeve disposed around said outer surface of said body, said sleeve including a material relatively stronger under compression than said porous
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