An intervertebral joint prosthesis having a ball component (22) for engagement with a first vertebra (26) and a trough component (24) for engagement with a second vertebra (27) adjacent to the first vertebra is disclosed. The trough component (24) includes a generally concave surface (50) having a substantially...http://www.google.com/patents/US6540785?utm_source=gb-gplus-sharePatent US6540785 - Artificial intervertebral joint permitting translational and rotational motion
