Poly(lactic-co-glycolic acid) bone scaffolds with inverted colloidal crystal geometry
Meghan J Cuddihy1, Nicholas A Kotov
1Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
Tissue Engineering. Part A
|May 22, 2008
Summary
This study presents a novel biodegradable poly(lactic-co-glycolic acid) (PLGA) scaffold with an ordered inverted colloidal crystal (ICC) structure. This design offers controlled porosity and enhanced mechanical properties for bone tissue engineering applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Materials Science
Background:
- Scaffold architecture is crucial for bone tissue engineering, requiring controlled porosity, interconnectivity, and mechanical strength.
- Current methods often yield random porosity, necessitating high pore percentages (>95%) for interconnectivity, which compromises mechanical integrity and leads to variability.
- Achieving predictable and robust scaffold properties remains a challenge in bone regeneration.
Purpose of the Study:
- To develop a biodegradable poly(lactic-co-glycolic acid) (PLGA) scaffold with an ordered inverted colloidal crystal (ICC) structure.
- To demonstrate precise control over scaffold architecture, including cavity and interconnecting channel dimensions.
- To achieve full interconnectivity at lower porosities while maintaining superior mechanical properties and biocompatibility for bone tissue engineering.
Main Methods:
- Fabrication of colloidal crystals (CCs) using soda lime beads (100-, 200-, 330-µm diameters).
- Annealing of CCs followed by infiltration with 85:15 poly(lactic-co-glycolic acid) (PLGA).
- Characterization of scaffold structure, porosity, interconnectivity, mechanical properties, and in vitro biocompatibility.
Main Results:
- The inverted colloidal crystal (ICC) structure provided a highly ordered arrangement of spherical cavities with controllable dimensions.
- Full interconnectivity was achieved at significantly lower porosities compared to random structures.
- The PLGA scaffolds exhibited high mechanical properties (>50 MPa), demonstrated in vitro biocompatibility, and supported osteoblast phenotype maintenance.
Conclusions:
- The developed PLGA scaffold with an ICC structure offers a highly controllable architecture for bone tissue engineering.
- This approach overcomes limitations of random porosity, providing enhanced mechanical properties and predictable interconnectivity.
- These scaffolds show significant promise for promoting bone growth in tissue engineering implants.
