The invention relates to a joint prosthesis with a cap having a supporting surface, a telescopic arrangement having a telescopic component on a cap side and a telescopic component on a holder side and connected to a holder for securing to a bone surface, wherein the supporting surface is formed by...http://www.google.ca/patents/US5800557?utm_source=gb-gplus-sharePatent US5800557 - Joint prosthesis and device for making a drilling in at least one joint head 
