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...http://www.google.se/patents/US7556648?utm_source=gb-gplus-sharePatent US7556648 - Spinal implant
