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Fractures: Bone Repair

Fractures: Bone Repair

Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...

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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

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Published on: October 23, 2015

Shape Memory Polymer Bioglass Composite Scaffolds Designed to Heal Complex Bone Defects.

Brandon M Nitschke¹, Elizabeth A Butchko¹, MaryGrace N Wahby¹

¹Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, United States.

ACS Biomaterials Science & Engineering

|October 4, 2024

Summary

New bioactive shape memory polymer scaffolds were developed for bone defects. These self-fitting scaffolds incorporate bioglass, enhancing bone regeneration and degradation rates for improved craniomaxillofacial treatments.

Keywords:

bioactivity bioceramic bioglass bone regeneration composite polymer scaffold

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Area of Science:

Biomaterials Science
Polymer Chemistry
Tissue Engineering

Background:

Irregular craniomaxillofacial bone defects require advanced treatment solutions.
Existing shape memory polymer (SMP) scaffolds based on poly(ε-caprolactone) (PCL) offer self-fitting capabilities but lack inherent bioactivity.
Incorporating poly(l-lactic acid) (PLLA) into semi-interpenetrating networks (semi-IPNs) enhances degradation rates but doesn't address bioactivity.

Purpose of the Study:

To develop bioactive SMP composite scaffolds for craniomaxillofacial bone defect treatment.
To impart bioactivity using 45S5 bioglass (BG) while maintaining self-fitting and mechanical properties.
To evaluate the effect of BG incorporation on scaffold bioactivity, degradation, and shape memory behavior.

Main Methods:

Fabrication of SMP composite scaffolds using a solvent-cast particulate leaching method with fused salt templates.
Incorporation of 45S5 bioglass (BG) at 2.5, 5, and 10 wt % into PCL-based semi-IPN scaffolds.
Characterization of scaffold pore integrity, mechanical properties, shape memory behavior, bioactivity (hydroxyapatite mineralization), and in vitro degradation.

Main Results:

Composite scaffolds with good pore wall integrity were successfully fabricated with varying BG content.
All scaffolds exhibited non-brittle behavior and retained excellent shape memory properties.
Scaffolds with 5 and 10 wt % BG demonstrated hydroxyapatite mineralization in simulated body fluid and increased in vitro degradation rates.

Conclusions:

The developed PCL-based semi-IPN composite scaffolds successfully integrate 45S5 bioglass to impart bioactivity.
These bioactive scaffolds maintain crucial shape memory properties and exhibit enhanced degradation and mineralization.
The findings suggest these novel scaffolds are promising for treating craniomaxillofacial bone defects, promoting osteoinductivity and osseointegration.