Biomimetic short fiber reinforced 3-dimensional scaffold for bone tissue regeneration.

Bone defects caused by diseases and trauma are considered as serious clinical challenges. Autologous and allogeneic transplantations are most widely used methods to mitigate bone defects. However, transplantation poses risks such as secondary trauma, immune rejection and disease transmission to patients. Preparing a biologically active bone tissue engineering scaffold as a bone substitute can overcome this problem. In current study, a PLGA/gelatin (Gel) short fiber-reinforced composite 3D scaffold was fabricated by electrospinning for bone tissue defect repair. A hybrid scaffold adding inorganic materials hydrotalcite (CaAl-LDH) and osteogenic factors deferoxamine (DFO) based on PLGA and Gel composite filaments was prepared. The structure, swelling, drug release and compressive resilience performance of the three-dimensional scaffolds in a wet state were characterized and osteogenic effect of the crosslinked-scaffold (C-DLPG) was also investigated. The scaffold has shown the optimum physicochemical attributes which still has 380 kPa stress after 60% compression cycle and sustainedly released the drug for about twenty days. Moreover, a promising In vivo osteogenic performance was noted with better tissue organization. At 8 weeks after implantation, the C-DLPG scaffold could basically fill the bone defect site, and the new bone area reached 19 mm2. The three-dimensional microfiber scaffold, in this study, is expected to be a promising candidate for the treatment of bone defects in the future.&#xD.