Patent ID: 8409290

Claim:
An intervertebral spacer comprising: a leading end; a trailing end comprising an opening; an arcuate anterior side connecting the leading end and the trailing end; an arcuate posterior side opposite to the arcuate anterior side and connecting the leading end and the trailing end; a superior side and an inferior side, and wherein the leading end extends continuously from the superior side to the inferior side; a major axis extending from the leading end to the trailing end of the spacer; a first interdigitation feature on an outside surface of the posterior side, the first interdigitation feature oriented lengthwise in a direction perpendicular to the major axis, wherein the first interdigitation feature comprises a first plurality of rails; and a second plurality of rails on an outside surface of the leading end, extending from the arcuate anterior side to the arcuate posterior side and lengthwise oriented in a direction perpendicular to that of the first plurality of rails.