Bone response and mechanical strength of rabbit femoral defects filled with inj...

• Author(s): Link, Dennis P. ; Van den Dolder, Juliette ; Van den Beucken, Jeroen J. ; Wolke, Joop G. ; Mikos, Antonios G. ; Jansen, John A.
• Date: 2008
• Persistent ID: http://hdl.handle.net/1822/13737
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Injectable CaP cement; Gelatin microparticles; TGF-β1; Mechanical properties; Bone ingrowth
• Document Type: Article
• Language: English

Description

This study focused at the potential of transforming growth factor β1 (TGF-β1) loaded gelatin microparticles to enhance the bone response and mechanical strength of rabbit femoral defects filled with injectable calcium phosphate (CaP)/gelatin microparticle composites. Therefore, TGF-β1 loaded composites and non-loaded controls were injected in circular defects as created in the femoral condyles of rabbits and were left in place for 4, 8 and 12 weeks. The specimens were evaluated mechanically (push-out test), and morphologically (scanning electron microscopy (SEM), histology, and histomorphometry). The results showed a gradual increase in mechanical strength with increasing implantation periods. Histological and histomorphometrical evaluation showed similar results for both composite formulations regarding histological aspect, new bone formation and bone/implant contact. However, TGF-β1 loading of the composites demonstrated a significant effect on composite degradation after twelve weeks of implantation. The results of this study showed that CaP/gelatin composites show excellent osteogenic properties and a rapid increase in mechanical strength. The addition of TGF-β1 significantly enhances the bone remodeling process.