SURFACE BY DESIGN™
- Provides immediate stability with surface features designed for significant friction to help prevent motion
Encourages bone cell proliferation with roughened titanium surface1,2
Promotes “mechanical fusion” bone ingrowth for short-term stability, using trabecular, bone-like surface design, with an average pore diameter of 500µm
Spira®’s open architecture, arched design has large openings for significant graft packing. It decreases the risk of subsidence due to the design’s “snowshoe effect” and provides good visibility for fusion.
Newly-forming bone grows onto and through the multiple roughened titanium arches to achieve maximum stability and complete endplate-to-endplate arthrodesis.
The implant enables easy insertion with a smooth leading edge and pockets that interlock with the inserter to provide rotational stability.
The arched design enables a distribution of load and stress throughout the cage, which is known from Wolff’s law to enhance fusion, and protects fusion zones from stress.
 Deligianni, D. D., et al. “Effect of surface roughness of the titanium alloy Ti–6Al–4V on human bone marrow cell response and on protein adsorption.” Biomaterials 22.11 (2001): 1241-1251.
 Martin, J. Y., et al. “Effect of titanium surface roughness on proliferation, differentiation, and protein synthesis of human osteoblast‐like cells (MG63).” Journal of biomedical materials research 29.3 (1995): 389-401.