Patent ID: 8128700

Claim:
An allograft intervertebral implant sized and configured for implantation between first and second adjacent vertebra via a transforaminal lumbar interbody fusion technique, the implant comprising: an allograft body formed from at least two pieces of allograft bone, the body including a curved front surface, a curved back surface, a pair of ends separating the curved front and back surfaces, an upper surface and a lower surface wherein the upper and lower surfaces are sized and configured for contacting at least a portion of the first and second vertebrae, the curved front and back surfaces defining an outer perimeter of the implant, at least one vertical through-bore extending from the upper surface to the lower surface, the vertical through-bore being about half the length of the curved front surface or longer and configured to receive bone graft material; wherein the first allograft bone piece has the upper surface and an opposite interface surface, the interface surface configured so that its thickness at the pair of ends is relatively equal, the interface surface containing the first portion of a dovetail joint and the second allograft bone piece has the lower surface and an opposite interface surface, the interface surface configured so that its thickness at the pair of ends is relatively equal, the interface surface containing the second portion of the dovetail joint, the at least two pieces of allograft bone are joined together by the dovetail joint, the dovetail joint having a curved shape that substantially follows the contours of the curved front and back surfaces of the body.