Interbody implants and optimization features thereof

A spinal interbody device (IBD), comprising:

• at least one solid structure;
• at least one porous structure, the solid and porous structures being formed integrally with each other;
• a plurality of pyramidal bone-engaging projections having a flat upper surface on the solid structure, the projections including partially solid portions and partially porous portions, the partially solid portions and partially porous portions formed monolithically with each other;
• and
• a graft window extending from a superior side of the IBD to an inferior side of the IBD.

A spinal interbody device (IBD), comprising:

• a solid structure comprising a plurality of rods from a first edge of a top surface of the IBD to a second edge of the top surface of the IBD;
• a porous structure connected to the solid structure;
• and
• a plurality of pyramidal bone-engaging projections having a flat upper surface on the solid structure, the projections including partially solid portions and partially porous portions, the partially solid portions and partially porous portions formed monolithically with each other.