Advances in three-dimensional bioprinting of bone: Progress and challenges

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Tissue Engineering

Background:

• Conventional bone tissue engineering strategies have yielded limited clinical success.
• Three-dimensional (3D) bioprinting has emerged as a powerful tool for creating functional bone tissue equivalents.
• Bioprinting recreates the dynamic 3D micro-environment crucial for native bone function.

Purpose of the Study:

• To review recent advancements in 3D bioprinting for bone tissue engineering.
• To identify limitations, challenges, and future strategies in this rapidly developing field.
• To provide insights into cellular interactions within hydrogel matrices for regulated stem cell behavior.

Main Methods:

• Review of current literature on 3D bioprinting techniques for bone regeneration.
• Analysis of challenges including bio-ink selection, cell sourcing, and bioprinting methods.
• Discussion of preclinical testing parameters such as stability, mechanical loading, and immune response.

Main Results:

• Successful development of functional, mechanically robust 3D bone prototypes with bone marrow using bioprinting.
• Identification of key challenges hindering clinical translation, including cell viability and long-term construct maintenance.
• Highlighting the potential of bioprinting to replicate heterogeneous bone tissues.

Conclusions:

• 3D bioprinting shows significant potential for bone tissue engineering, offering a dynamic micro-environment.
• Overcoming challenges in bio-ink formulation, cell sourcing, and preclinical validation is critical for clinical application.
• Further research into hydrogel-cell interactions will drive innovation in stem cell-based bone regeneration.