Prosthesis for restoring motion in an appendage or spinal joint and an intervertebral spacer
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United States of America Patent
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Sep 21, 2010
Grant Date -
Mar 26, 2009
app pub date -
Apr 28, 2006
filing date -
May 2, 2005
priority date (Note) -
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Abstract
A motion restoring prosthesis to be interposed between the ends of two bones adjoining a mammalian appendage or spinal joint is formed of two components with the components having inner cooperating articulating surfaces and outer bone engaging surfaces. At least one of the components has an inner section made of relatively hard, stiff material defining one or the articulating surfaces and an outer section made of a softer material defining the bone engaging surface. The softer material having a hardness/stiffness characteristic compatible with the bone to reduce stress shielding and more evenly distribute the forces from the articulating surfaces to the associate bone interface.
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