LONDON – Sirakoss Ltd. has received FDA 510(k) clearance for its nanoparticle synthetic bone graft substitute, after showing the ready-to-use putty is equivalent to the CE-approved dry formulation. Rather than granules that are mixed with a patient’s blood before administration, the inorganic calcium phosphate-based Osteo³ Zp putty consists of the granules suspended in a fully synthetic resorbable carrier.