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Establishment of a Segmental Femoral Critical-size Defect Model in Mice Stabilized by Plate Osteosynthesis
Published on: October 12, 2016
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Self-deploying shape memory polymer scaffolds for grafting and stabilizing complex bone defects: A mouse femoral
Richard M Baker1, Ling-Fang Tseng1, Maria T Iannolo2
1Department of Biomedical and Chemical Engineering, Syracuse University, New York, 13244, USA; Syracuse Biomaterials Institute, Syracuse University, New York, 13244, USA.
Biomaterials
|November 13, 2015
Summary
Shape memory polymers (SMPs) show promise for bone defect repair, integrating with native bone and offering comparable mechanical properties to traditional grafts. These novel materials could enhance synthetic bone graft substitutes and stabilization devices.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Polymer Science
Background:
- Complex bone defects present a significant healthcare challenge.
- Current treatments involve bone grafting and stabilization with metallic implants or external fixators.
- There is a need for advanced synthetic materials to improve bone defect management.
Purpose of the Study:
- To introduce and evaluate shape memory polymer (SMP) materials for bone grafting and stabilization of segmental defects.
- To assess the in vivo integration and mechanical performance of SMP grafts and sleeves.
- To explore the potential of SMPs in enhancing synthetic bone graft substitutes.
Main Methods:
- Development of self-deploying SMP grafts and expandable/contractible SMP sleeves.
- In vivo evaluation in a mouse segmental bone defect model.
- Assessment of bone integration and mechanical properties using radiography, microcomputed tomography, and torsional testing.
Main Results:
- SMP grafts integrated with native bone within 12 weeks, maintaining defect stability.
- SMP grafts demonstrated torsional mechanical properties comparable to allografts, without significant de novo bone formation.
- SMP sleeves did not impede bone bridging and, when combined with allografts, provided comparable torsional strength to allografts alone.
- In vitro tests indicated SMP sleeves enhance torsional stability.
Conclusions:
- Shape memory polymers show potential as bone graft substitutes and adjunct stabilization devices.
- SMPs can integrate with native bone and provide mechanical support for segmental defects.
- Incorporating shape memory into synthetic materials may significantly improve their functionality in orthopedic applications.
