Chitosan-Based High-Intensity Modification of the Biodegradable Substitutes for Cancellous Bone

Current treatments for bone defects often rely on autografts or allografts, which come with limitations such as donor site morbidity and limited availability. Synthetic bone substitutes offer an alternative but must mimic natural bone structure and function to support tissue regeneration. While polylactide (PLA) scaffolds have been explored for their biocompatibility, achieving cancellous bone-like morphology remains a challenge. Prior research has shown that phase inversion techniques can produce porous scaffolds, but few studies address how surface modification affects cell adhesion and scaffold performance. This gap motivated investigations into how chitosan could enhance scaffold properties. No prior work had resolved how chitosan modification impacts both hydrophilicity and cell viability in cancellous bone substitutes. Understanding these interactions could improve the design of biodegradable scaffolds for bone regeneration.

The aim of this work is to develop a new method for modifying polylactide scaffolds with chitosan to improve their suitability as cancellous bone substitutes. The specific problem is how to create scaffolds with both the correct morphology and surface properties to support bone cell growth. The motivation stems from the need for biodegradable scaffolds that closely resemble natural bone structure. The study focuses on whether chitosan surface modification can enhance scaffold performance without altering the underlying polymer structure. The researchers propose that chitosan can improve hydrophilicity and surface roughness, which may influence cell adhesion. This approach may offer a safer and more effective alternative to current methods. By using non-toxic reagents, the method could be more suitable for clinical applications. The study also investigates how these modifications affect in vitro cell viability and scaffold performance.

The study uses phase inversion with freeze extraction to fabricate polylactide scaffolds with a pore size of 100–400 µm and open porosity of 94%. Surface modification is achieved through dipping in chitosan solution to deposit a hydrophilic layer. The scaffolds are analyzed for morphology, porosity, and surface roughness using standard techniques. Surface free energy is measured to assess how chitosan affects scaffold-cell interactions. In vitro tests evaluate how these modifications influence cell adhesion and viability. The method avoids high-temperature processing to preserve the scaffold structure. The use of non-toxic reagents ensures compatibility with biological systems. The approach combines material science and tissue engineering principles to develop a novel modification strategy.

The scaffolds produced using phase inversion with freeze extraction have a pore size of 100–400 µm and open porosity of 94%, resembling cancellous bone morphology. Chitosan surface modification increases hydrophilicity and surface roughness without altering the PLA matrix structure. The modified scaffolds maintain high absorbability, reaching 850% dry weight. Surface free energy changes promote better bone cell adhesion. In vitro studies show that these scaffolds support cell viability and growth. The chitosan layer remains stable without degrading the underlying polymer. The method successfully introduces a functional surface without compromising scaffold integrity. These results suggest that chitosan modification enhances scaffold performance for bone regeneration.

The study demonstrates a new low-temperature method for modifying polylactide scaffolds with chitosan to improve their performance as cancellous bone substitutes. The authors propose that this approach preserves scaffold structure while enhancing hydrophilicity and cell adhesion. The method uses non-toxic reagents, making it suitable for clinical applications. The results suggest that chitosan modification increases surface roughness and free energy, promoting bone cell growth. The in vitro findings support the idea that these scaffolds can mimic cancellous bone properties. The researchers suggest that these scaffolds may serve as PRP carriers in future medical devices. The method does not alter the PLA matrix, ensuring structural integrity. These findings may guide the development of biodegradable scaffolds for bone regeneration.