Guided tissue fabrication from periosteum using preformed biodegradable polymer scaffolds

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Tissue engineering aims to replicate natural bone grafts for bone replacement.
• Synthetic scaffolds, osteogenic cells, and bone induction factors are key components.
• Poly(DL-lactic-co-glycolic acid) (PLGA) is a promising biodegradable polymer for scaffolds.

Purpose of the Study:

• To evaluate the suitability of different poly(DL-lactic-co-glycolic acid) (PLGA) foam formulations as tissue-conducting scaffolds for bone flap fabrication.
• To assess the in vivo performance of PLGA scaffolds in an ovine model.
• To investigate the osteogenic potential and biocompatibility of PLGA scaffolds.

Main Methods:

• Three PLGA foam formulations with varying copolymer ratios and molecular weights were prepared.
• Porous PLGA wafers were assembled into chambers and implanted in ovine rib beds, some with autologous morcellized bone graft (MBG).
• Chambers were harvested after 8 weeks for gross and histologic examination.

Main Results:

• Vascularized tissue molded to chamber shape and attached to the periosteum was observed.
• Polymer degradation varied by formulation.
• New bone formation occurred exclusively in areas containing MBG; no significant inflammation or damage was noted.

Conclusions:

• PLGA foam scaffolds are effective tissue conductors and shape-molding agents but are not osteoinductive.
• The scaffolds demonstrated biocompatibility in the ovine model.
• Further research is needed to incorporate bone induction factors for enhanced osseous tissue generation.