| http://www.w3.org/ns/prov#value | - An intervertebral spacer in the form of a rigid, porous body made of a biocompatible polymer material, the body being strong enough to accommodate loads imposed by adjacent vertebrae and porous enough to facilitate tissue ingrowth and bony fusion, the body including a plurality of randomly sized, substantially interconnected voids that provide porosity throughout the body, wherein the polymer is i
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