Importance

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Abstract

A cage assembly adapted to be implanted in a spinal column for treating degenerative or ruptured discs and replacing damaged vertebral bodies. The assembly includes one or more rigid cages formed in an annular configuration and having opposed upper and lower perimeter surfaces, an annular side wall extending between said surfaces, a transverse inner wall extending across said cage, a plurality of raised ridges projecting outwardly from each of said perimeter surfaces for engaging the spinal column and securing the assembly therein. Apertures are provided in the side wall for use in positioning said cage in the spinal column and a pair of aligned openings extend axially through the cage for packing the cage with bone graft material. At least one spacing element having the same annular configuration as the cages can be provided to effect the stacked attachment of one cage with another in rigid axial alignment.

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First Claim