A spinal implant including a hollow, generally tubular shell having an exterior lateral surface, a leading end, and a trailing end. The exterior surface includes a plurality of pillars arranged in a non-helical array. Each pillar has a height of 100-4500 microns and a lateral dimension at the widest point of 100-4500 microns. The exterior surface also has a plurality of holes therethrough to permit bone ingrowth therethrough.