PMMA Bone Cements
Phone: +49 351 2599 9410
Fax: +49 351 2599 9429
PMMA-based bone cement is one of the most common biomaterials implanted with direct contact to bone tissue and is increasingly used for minimal invasive stabilization of osteoporotic fractures, especially of the vertebra (vertebroplasty). However, most conventional bone cements are not optimized for minimal invasive treatment of fractured osteoporotic bone. Limited injectability, complex and unreliable handling properties due to changing viscosity during setting, a narrow application window and biomechanical mismatch with osteoporotic bone are known disadvantages. Furthermore, PMMA bone cements generally show poor bioactivity or missing osteoconductivity, respectively, which prevents the implanted material from being actively integrated into bone.
Therefore, our activities are focused on new formulations of easily injectable, bioactive polymeric bone cements applicable in many clinically relevant indications with special emphasis on the requirements of minimal invasive application in osteoporotic fractures.
One of INNOTERE's innovative developments is a ready-to-use 2-paste PMMA cement system with a significantly improved handling during surgery. It is based on two paste components separately stored in a double-chamber syringe. By means of a static mixer, both components can be mixed directly at the operation side, which initiates the cement setting reaction. The innovative material system features:
a constant cement viscosity during application
an unlimited application time, also allowing interruption of the surgical procedure
significantly reduced release of monomer vapor
Furthermore, the cement system comprises all necessary components for the application of the PMMA cement (cement, mixing system, applicator) and is thus cheaper compared to conventional acrylic bone cements.
A further innovation by INNOTERE are bioactive PMMA-based bone cements, which show a significantly higher bone affinity index compared to conventional non-modified PMMA bone cements, indicating a highly significant increase of bioactivity. Furthermore, we could demonstrate that our bioactivation concept does not deteriorate important material properties like mechanics (compressive strength, bending strength), setting reaction (dough and setting time, hardening temperature) and monomer release. Several commercial PMMA-bone cements were successfully subjected to our modification for bioactivity, demonstrating that this technology is of general applicability.
In vivo evaluation of bioactive PMMA-based bone cement with unchanged mechanical properties in a load-bearing model on rabbits. Fottner A, Nies B, Kitanovic D, Steinbrück A, Hausdorf J, Mayer-Wagner S, Pohl U, Jansson V J Biomater Appl 2015
Physicochemical and cell biological characterization of PMMA bone cements modified with additives to increase bioactivity. Wolf-Brandstetter C, Roessler S, Storch S, Hempel U, Gbureck U, Nies B, Bierbaum S, Scharnweber D J Biomed Mater Res B Appl Biomater 2013
Mechanical properties and drug release behavior of bioactivated PMMA cements. Vorndran E, Spohn N, Nies B, Rößler S, Storch S, Gbureck U J Biomater Appl 2012