Patent ID: 8888862

Claim:
A permanent bone implant comprising a stem extending between a proximal end and a distal end, the stem having an integral anchoring structure at a surface of the stem, wherein said distal end has a smaller cross section than said proximal end, the structure comprising an array of mutually spaced pointed teeth formed along at least a portion of the length of the stem, each tooth forming an overhang generally in the form of a claw having an upper surface with convergent edges defining a point of the tooth extending towards said distal end and for digging into a bone in a direction in which the stem is to be attached, and a network of pores underlying the array and communicating with an exterior of the surface via openings between the teeth, the network of pores allowing for circulation of nutrients to promote bone growth, wherein the structure comprises a grid of intersecting struts supported above a core of the implant by a plurality of pillars, each pillar intersecting the grid at respective intersections of the struts and extending upwardly beyond the strut intersection to form the teeth.