| 摘要 |
An intervertebral joint prosthesis (20) 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 (26) is disclosed. The trough component (24) includes a generally concave surface (50) having a substantially flat portion (52). When the ball component (22) and the trough component (24) are engaged to their respective vertebrae (26, 27), the ball component (72) and the trough component (24) engage each other, permitting rotation and translation of the vertebrae (26, 27) with respect to each other. Both components (22, 24) include a flange (34, 56) for engaging a vertebra (26, 27). The invention also contemplates a tool (70) for use in implanting a two-piece intervertebral joint prosthesis (20). <IMAGE>
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