Importance

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Abstract

With respect to artificial disc replacements (ADRs) and total disc replacements (TDRs) having projections that penetrate vertebral endplates, methods and apparatus are disclosed that allow longer projections to be used for a given level of distraction. An inventive tool is used to install a second component in aligned registration subsequent to the installation of a first, opposing component. Inserting the components separately enables the use of longer projections. Although described in terms of 'endplates,' the invention will work equally well in conjunction with intradiscal devices without a spacer; that is, with one or both components of a total disc replacement (TDR) that articulate directly against one another. In addition, although the disclosure illustrates the use of an instrument that fits into a cylinder-like concavity, compatibility with other geometric shapes and grasping features is clearly anticipated, whether formed into the components or extending therefrom.

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First Claim