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Image Number 3 for United States Patent #5405399.
A total prothesis for the metacarpo-phalangeal joint which includes a first element for anchoring in the phalangeal diaphysis having a tapering head provided with at least two articular surfaces of concave profile and a second element for anchoring in the metacarpo diaphysis having a head including at least two separate articular surfaces. One of the articular surfaces of the second element is generally convex and the other articular surface includes an arcuate ridge which extends outwardly relative to the convex articular surface and toward the articular surfaces of the first element.
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