Friction Fit and Vertebral Endplate-Preserving Spinal Implant

An interbody spinal implant generally oval-shaped in transverse cross-section and comprising:

• a top surface, a bottom surface, opposing lateral sides, and opposing anterior and posterior portions, the posterior portion defining a leading end for insertion first into a disc space, having a generally rounded nose profile, and having a shorter height than the anterior portion thereby defining a lordotic angle for aligning spine of a patient;
• a roughened surface topography adapted to grip bone and inhibit migration of the implant on at least a portion of the top surface, the bottom surface, or both the top and bottom surfaces;
• generally rounded intersections defined along the entire lengths between the top surface and the posterior portion, the bottom surface and the posterior portion, the top surface and the lateral sides, and the bottom surface and the lateral sides;
• a sharp edge between the top and bottom surfaces and the anterior portion to resist pullout;
• the spinal implant being substantially hollow and having a centrally disposed vertical aperture (a) extending from the top surface to the bottom surface, (b) defining a transverse rim with a varying width or thickness, and (c) having a maximum width at its center, between the opposing lateral sides, and tapering inwardly from the center to each of its ends, one end proximate the anterior portion and the other end proximate the posterior portion.