Silk fibroin-PLA scaffolds offer a balanced route for bone regeneration

Silk fibroin and polylactic acid have long attracted interest as biomaterials, but their different properties have made their combination particularly relevant for tissue-engineering applications. A new perspective in the Journal of Bioresources and Bioproducts examines how SF/PLA composite scaffolds can be designed to balance mechanical support, biological activity and controlled degradation in bone and other musculoskeletal tissues.

The review identifies a complementary relationship between the two materials. Silk fibroin provides hydrophilicity, cell-interactive properties and enzymatically tunable degradation, while PLA offers stiffness, structural persistence and established processing technologies. Their combination may therefore help address the limitations of using either material alone. The authors emphasize that this balance depends not simply on composition, but also on fibre architecture, interfacial bonding, porosity and degradation behaviour.

The perspective compares several fabrication approaches, including electrospinning, 3D printing and injection or pouring moulding. Representative studies have demonstrated improved cell responses, osteogenic activity, mechanical performance and tissue repair in different experimental models. At the same time, the review distinguishes laboratory observations from stronger preclinical evidence, noting that reported improvements are highly dependent on material formulation, scaffold architecture and testing conditions.

Importantly, the authors place clinical translation in a cautious context. Current evidence remains dominated by in vitro and small-animal studies, while no human clinical trial of an SF/PLA composite scaffold was identified in the reviewed evidence. Variability in silk fibroin processing, phase separation between hydrophilic SF and hydrophobic PLA, manufacturing reproducibility, long-term degradation and regulatory requirements remain significant challenges.

Looking ahead, the review highlights AI-assisted scaffold design, dynamic microenvironment regulation and immunomodulatory systems as promising research directions, while stressing that these concepts still require experimental validation. The authors argue that future progress will depend on integrating material design, scalable manufacturing and rigorous long-term biological evaluation rather than pursuing mechanical or biological performance in isolation.

See the article:

DOI

https://doi.org/10.1016/j.jobab.2026.100302

Original Source URL

https://www.sciencedirect.com/science/article/pii/S2369969826000745

Journal

Journal of Bioresources and Bioproducts