<p>The facet prosthesis (102,202) includes a first member (104) for attachment to a first disc in use and a second member (106) for attachment to a second disc in use. At least a part (112) of the first member is telescopically or slidably mounted in at least a part (120) of the second member in use. The facet joint prosthesis may form a system with a disc prosthesis (2).</p>
