Hard-tissue implant comprising a bulk implant, a face, pillars, slots, and at least one support member

A hard-tissue implant comprising:

• (a) a bulk implant;
• (b) a face being an exterior surface of the bulk implant;
• (c) pillars for contacting a hard tissue, the pillars being distributed on the face, across an area of at least 30 mm2, and extending distally therefrom, and each pillar being integral to the bulk implant, having a distal end, having a transverse area of (100×100) to (10,000×10,000) μm2, and having a height of 100 to 10,000 μm;
• (d) slots to be occupied by the hard tissue, the slots being defined by the pillars and each slot having a width of 100 to 10,000 μm as measured along the shortest distance between adjacent pillars;
• and
• (e) at least one support member for contacting the hard tissue, the at least one support member being positioned on the face among the pillars, extending distally from the face, and having a transverse area greater than the transverse area of any of the pillars;
• wherein:
• the hard-tissue implant has a Young's modulus of elasticity of at least 3 GPa, and has a ratio of (i) the sum of the volumes of the slots to (ii) the sum of the volumes of the pillars and the volumes of the slots of 0.40:1 to 0.90:1;
• and
• the hard-tissue implant is selected from the group consisting of a glenoid implant for shoulder, a distal radius plate implant for wrist, a tibial implant for ankle, and an artificial disc implant for spine.