Bone and bone tendon allograft tissue are two of the most valuable products produced through tissue donation.  Utilizing NovaSterilis supercritical carbon dioxide to clean and sterilize these tissues produces SAL6 while maintaining the strength and qualities of a fresh graft.

Cortical Bone

FDA guidelines for ensuring the sterility of musculoskeletal allografts require SAL3, or a high level of disinfection (not sterilization). The American Association of Tissue Banks (AATB) has adopted the more desirable SAL6** requirement for all tissue bank allografts. Therefore, providing terminally-sterilized allogeneic material at SAL6 is a requirement for all allografts labelled as sterile. Providing terminally sterilized allograft material (SAL6) for clinical use could significantly reduce the risk of infection for the millions of allograft recipients in the United States each year. Studies performed at NovaSterilis, and validated by our partners, demonstrate that SAL6 is obtainable when the NovaSterilis Cortical Bone Cleaning/Sterilization Protocol is followed using the Nova2200™ or Nova8800™ system.

** SAL6 means that there is less than or equal to one chance in a million that an item remains contaminated or nonsterile.

Cortical Bone Sterilization
Cortical bone (Left) compared to cortical bone after sterilization in the Nova2200 (Right)


Photos of sterilized BTBs show that SCCO2 treated tendon is much whiter and cleaner when compared to the untreated and gamma-irradiated tendon. The BTB allografts lose around 14% of their weight due to extraction of lipids, excess fluids, and organic material when cleaned and sterilized with SCCO2. Lipid removal from the graft has been previously shown to increase graft incorporation following transplant. Lipid removal enhances accessibility to the structure of the bone which may improve the osteoconduction following transplant.

Sterilized bisected BTB
Sterilized bisected BTB from a single donor
Sterilized shaped BTB
Sterilized shaped BTB prepared for transplant