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Use is claimed of barium- and/or zirconium- and/or other X-ray-opaque element-containing (co)polymers as X-ray contrast agents in bone cements. Independent claims are also included for (1) an X-ray contrast agent comprising either (i) a (co)polymer with a chemically-bonded compound of an X-ray-opaque element or (ii) approximately spherical (co)polymer particles with dispersed X-ray-opaque 3-15nm...