Bone Substitute Biomaterials for Tissue Regeneration

Bone substitute biomaterials encompass a broad range of natural and synthetic scaffolds designed to support or replace damaged osseous tissue. Their guiding principles include osteoconductivity, which permits the ingrowth of new bone along a three-dimensional template; osteoinductivity, which stimulates progenitor cells to differentiate into bone-forming osteoblasts; and osteogenesis, the process of new bone formation. Traditional autografts remain the clinical gold standard but are limited by donor-site morbidity and supply. Allogeneic and xenogeneic grafts offer off-the-shelf alternatives yet carry immunogenic and pathogen-transmission risks. Synthetic substitutes such as calcium phosphates, bioactive glasses and polymer composites aim to overcome these shortcomings, tailoring degradation rates, porosity and mechanical properties to the defect site. Emerging strategies focus on surface modification, therapeutic ion incorporation and integration with biologically active factors to modulate host immune responses, promote vascularisation and achieve seamless integration with surrounding tissue. The ultimate goal is to provide a scaffold that degrades in concert with new bone deposition, restoring both form and function.

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Bone Substitute Biomaterials for Tissue Regeneration publication trend

The graph below shows the total number of articles in bone substitute biomaterials for tissue regeneration across all publications each year (not limited to Nature Index journals).

Technical terms

Osteoconductivity: The capacity of a scaffold to support the attachment and growth of new bone along its surface and within its porous structure.

Osteoinductivity: The ability of a material to induce undifferentiated mesenchymal cells to become osteoblasts, initiating new bone formation de novo.

Macrophage polarisation: The process by which macrophages adopt distinct functional phenotypes—classically activated (M1) or alternatively activated (M2)—that respectively promote inflammation or tissue repair.

Guided bone regeneration (GBR): A surgical technique using barrier membranes to create a secluded space for bone growth, preventing soft-tissue invasion and enhancing osseous healing.

Therapeutic ion doping: The incorporation of bioactive metal ions (e.g., Sr2+, Mg2+) into biomaterials to influence cellular responses, mineralisation and vascularisation.

References

1. Analyses of the Cellular Interactions between the Ossification of Collagen-Based Barrier Membranes and the Underlying Bone Defects. International Journal of Molecular Sciences (2023).
2. Biphasic bone substitutes coated with PLGA incorporating therapeutic ions Sr2+ and Mg2+: cytotoxicity cascade and in vivo response of immune and bone regeneration. Frontiers in Bioengineering and Biotechnology (2024).
3. In Vivo Analysis of the Biocompatibility and Immune Response of Jellyfish Collagen Scaffolds and its Suitability for Bone Regeneration. International Journal of Molecular Sciences (2020).