3D printed scaffold design for bone defects with improved mechanical and biological properties

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Orthopedic Surgery

Background:

• Bone defect treatment remains a clinical challenge, requiring synthetic scaffolds with optimal mechanical and biological functions.
• Ensuring adequate waste and nutrient exchange, alongside mechanical stability, is critical for scaffold performance, especially in larger defects.

Purpose of the Study:

• To introduce and evaluate novel 3D printed polymeric scaffolds featuring a continuous ZigZag-Spiral pattern for bone defect treatment.
• To assess the mechanical properties, mass transportation capabilities, and biological performance of these new scaffolds.

Main Methods:

• Fabrication of 3D printed polymeric scaffolds using a novel ZigZag-Spiral continuous pattern.
• Evaluation of scaffold permeability, mechanical properties (compared to 0-90° and 0-45° lay-down patterns), and cell attachment/morphology using human mesenchymal stem cells.

Main Results:

• The ZigZag-Spiral scaffolds demonstrated permeability comparable to natural bone.
• Scaffolds with the ZigZag-Spiral pattern exhibited superior mechanical properties at equivalent porosity levels compared to conventional patterns.
• Human mesenchymal stem cells showed gradual pore infilling in ZigZag-Spiral scaffolds, indicating favorable cell integration.

Conclusions:

• The ZigZag-Spiral pattern offers uniform pore size distribution, crucial for cell differentiation.
• These scaffolds present a promising alternative for bone defect treatment, effectively mimicking cancellous bone properties.
• The developed scaffolds provide a better balance of mechanical, mass transport, and biological characteristics for orthopedic applications.