| 摘要 |
The present invention is directed to an artificial prosthesis ( 50 ) that includes a first disc ( 56 ) with a first disc periphery ( 60 ), a first disc superior surface ( 58 ) and a first disc inferior surface ( 68 ) having a first mating portion ( 90 ), a second disc ( 54 ) having a second mating portion ( 80 ) that is substantially complementary to the first disc mating portion ( 90 ) and a convex surface ( 65 ), and a third disc ( 52 ) having a concave superior surface ( 62 ) that substantially complements the convex surface of the second disc ( 65 ).
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