3D-printed bone scaffold with glowing blood vessels and hydrogels

3D-Printed Bone Scaffolds: The Future of Healing?

Elliot Brynn monogram
Elliot Brynn in Health & Wellness October 2026 • 4 min read.

"Combining cutting-edge 3D printing with bioactive hydrogels and cell co-culture to revolutionize bone regeneration and prevascularization for better healing."


Vascularization, the development of blood vessels, is crucial for the success of large bone constructs in bone tissue engineering. It ensures that the newly formed bone tissue receives an adequate supply of oxygen and nutrients, facilitating its growth and integration with the host tissue. However, achieving sufficient vascularization in engineered bone grafts remains a significant challenge.

To address this challenge, researchers are exploring innovative strategies that combine 3D printing with hydrogel-based prevascularization techniques. This approach involves creating porous bone scaffolds using 3D printing, coating them with bioactive hydrogels containing human adipose-derived mesenchymal stem cells (ADMSC) and human umbilical vein endothelial cells (HUVEC), and then co-culturing these cells to promote vascularization.

This article delves into a study that utilizes this combined approach to generate pre-vascularized bone constructs. It examines how 3D printing, bioactive hydrogels, and cell co-culture work together to enhance bone regeneration and vascularization, offering new possibilities for treating large bone defects and improving patient outcomes.

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Research Activity and Clinical Scope

A 2023 bibliometric analysis identified 682 articles and review articles on 3D-printing bioink in bone tissue engineering from 2010 to 2022. Reviews describe 3D-printed scaffolds for bone regeneration in animal models and identify large-volume horizontal and vertical alveolar bone regeneration as potential clinical applications. A 2020 review examined how materials and scaffold design relate to host-tissue responses, while a 2026 study set out to compare clinical, technical, and economic outcomes of printed bone substitutes and traditional substitutes.

Established Repair and Emerging Printing

Autologous bone grafts are identified as one of the current methods for repairing bone defects, and the literature describes growing demand for reconstruction of complex bone defects. 3D bioprinting is presented as an approach that combines cells and selected biomaterials to create living macro-tissues. However, a review focused on clinical use characterizes 3D-printed bone-regeneration approaches as being at an early stage, with its discussion centered on preclinical large-animal studies and a few reports of clinical use. Reviews also discuss strategies to improve regeneration and future directions such as 4D bioprinting and biodegradable metal printing.

How Does the Combination of 3D Printing, Hydrogels, and Cell Co-Culture Enhance Bone Regeneration?

3D-printed bone scaffold with glowing blood vessels and hydrogels

The study's methodology involved several key steps. First, researchers encapsulated ADMSC and HUVEC within bioactive hydrogels made from hyaluronic acid (HA) and gelatin. These hydrogels provided a supportive environment for the cells, allowing them to interact and form capillary-like networks.

Next, the cell-laden hydrogels were coated onto 3D-printed polycaprolactone/hydroxyapatite (PCL/HAp) scaffolds. These scaffolds provided structural support and mimicked the natural bone environment, encouraging cell attachment and growth. The constructs were then cultured in hybrid media to assess vascularization and osteogenesis.

Here are the key techniques that promote faster healing:
  • Cell Encapsulation: ADMSC and HUVEC are mixed and then loaded inside silicone molds and exposed to UV light.
  • Cellular Spheroid Encapsulation: ADMSC or ADMSC-HUVEC cell spheroids are created and then encapsulated within hydrogels and kept in hybrid media.
  • Composite Constructs: 3D printing of PCL/HAp scaffolds and incorporation of cell-laden hydrogels that are either ADMSC or ADMSC-HUVEC. ADMSC-HUVEC can also be surface seeded onto PCL/Hap scaffolds.
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Co-Culture and Vascularization

A study summarized in a review surgically implanted 3D-printed scaffolds containing adipose-derived mesenchymal stem cells (ASCs), either alone or with human umbilical vein endothelial cells (HUVECs), into mice. The scaffolds containing both ASCs and HUVECs resulted in improved microvasculature formation and anastomosis with the host vasculature, compared with the ASC-containing scaffolds. The cited review on prevascularization also catalogs endothelial-lineage cell types and markers used for their identification, including HUVECs and endothelial progenitor cells.

Optimization Remains a Challenge

A review of 3D-printed bone scaffolds explicitly discusses both advantages and limitations of the printing technologies used to make them. It emphasizes that process parameters need to be optimized to achieve successful scaffolds. A separate review of large bone defects examines bio-ink compositions, scaffold requirements, and prior printing applications, underscoring the range of design and material considerations involved. The provided sources do not report a specific failure rate or comparative outcome.

Evidence on Printed and Traditional Substitutes

A 2026 study description states that it aims to systematically evaluate 3D-printed bone substitutes against traditional grafting techniques in maxillofacial reconstruction. Its planned outcomes include bone regeneration, surgical precision measured by distance and angular deviation, and operative duration. Another description of that study says the data include regeneration volume, surgery duration, treatment cost, deviation distance, and plate outcomes. The supplied material identifies these comparison measures but does not provide results establishing which approach performs better.

Finally, the prevascularized constructs were implanted into nude mice to evaluate their in vivo vascularization capacity and functionality. The results demonstrated that the 3D co-cultured ADMSC-HUVEC constructs generated capillary-like networks within the porous scaffolds, promoting in vitro vascularization without significantly affecting osteogenesis. Moreover, the hydrogel systems facilitated microvessel and lumen formation, encouraging anastomosis of human-origin vascular networks with the host's vasculature.

What Does This Mean for the Future of Bone Defect Treatments?

The findings of this study highlight the potential of prevascularized 3D printed scaffolds with anatomical shapes for healing larger bone defects. By combining 3D printing precision with the bioactive properties of hydrogels and cell co-culture, researchers can create constructs that not only provide structural support but also actively promote vascularization and integration with the host tissue.

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Promise and Integration Barriers

A recent review concludes that 3D printing is reshaping research and clinical applications in bone diseases through potential contributions to bone regeneration, surgical precision, and personalized treatment. It also identifies regulatory complexity, scalability, and interdisciplinary collaboration as challenges to full clinical integration. These are presented as conditions that must be addressed for the technology's broader integration, rather than as evidence that those challenges have already been resolved.

Developing Materials and Personalized Uses

A 2024 review outlines future directions for bone tissue engineering materials and 3D-bioprinting technology, offering theoretical support for further development. A 2025 study examines recent advances in 3D printing for bone tissue production and its potential in regenerative medicine and personalized healthcare, while also addressing current process challenges and possible research directions. A 2026 review discusses established clinical strategies for promoting bone regeneration, including distraction osteogenesis, casting, splinting, and bone grafting.

Clinical Potential and Integration Needs

A review describes 3D printing as offering opportunities for large-volume bone regeneration in oro-dental and craniofacial regions. It attributes this potential in part to CAD-CAM technologies that support the design and manufacture of anatomically accurate meshes and scaffolds. Another review identifies regulatory complexity, scalability, and interdisciplinary collaboration as challenges to full clinical integration. Together, these sources describe both a specific clinical opportunity and broader barriers to putting the technology into practice.

This approach represents a significant step forward in bone tissue engineering, offering a promising solution to the challenges associated with large bone defect treatments. The ability to generate patient-specific scaffolds with enhanced vascularization could lead to improved patient outcomes, reduced complications, and faster healing times.

Further research and development in this area could pave the way for clinical translation, bringing the benefits of prevascularized 3D printed bone scaffolds to patients in need of bone reconstruction and regeneration.

What the co-culture adds to the scaffold

The printed scaffold and cell-laden hydrogel served different roles in the experiment: together they formed a composite, and the co-cultured cells produced capillary-like networks inside it. That is evidence of vessel-like organization within the construct, rather than evidence by itself that a bone defect healed.[1]

The study assessed vascularization alongside osteogenesis. Its reported distinction is that co-culture promoted vascularization in vitro without a significant effect on osteogenesis, so the vascular result should not be read as proof of increased bone formation.[1]

  • The reported co-culture benefit concerned vascularization; osteogenesis did not show a significant response to the culture systems.[1]

What the printed scaffold study measured

Main outcomeVascularization and osteogenesis[1]
Times cited129[1]

Terms used in this study

Anastomosis
A connection between vascular networks.[1]

Sources

  1. Prevascularization of 3D printed bone scaffolds by bioactive hydrogels and cell co‐culture (Wiley, 2017)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

This article is based on research published under:

DOI-LINK: 10.1002/jbm.b.33994, Alternate LINK

Title: Prevascularization Of 3D Printed Bone Scaffolds By Bioactive Hydrogels And Cell Co-Culture

Subject: Biomedical Engineering

Journal: Journal of Biomedical Materials Research Part B: Applied Biomaterials

Publisher: Wiley

Authors: Mitchell A. Kuss, Shaohua Wu, Ying Wang, Jason B. Untrauer, Wenlong Li, Jung Yul Lim, Bin Duan

Published: 2017-09-13

Everything You Need To Know

1

How does the combination of 3D printing, hydrogels, and cell co-culture improve bone regeneration?

The combination of 3D printing, bioactive hydrogels, and cell co-culture significantly enhances bone regeneration by creating a supportive environment for cell growth and promoting vascularization. 3D printing allows for the creation of porous bone scaffolds, typically using PCL/HAp, providing structural support. These scaffolds are then coated with bioactive hydrogels, often made from hyaluronic acid (HA) and gelatin, which encapsulate ADMSC and HUVEC. The hydrogels offer a favorable environment for the cells to interact and form capillary-like networks. Finally, cell co-culture, the simultaneous culture of ADMSC and HUVEC, further enhances vascularization. This collaborative approach ensures the newly formed bone tissue receives adequate oxygen and nutrients, fostering its growth and integration with the host tissue, leading to better healing outcomes.

2

Why is vascularization so important in bone tissue engineering?

Vascularization is the development of blood vessels within the newly formed bone tissue. It is critical for the success of large bone constructs because it ensures the delivery of oxygen and nutrients necessary for bone tissue to grow and integrate with the host tissue. Without sufficient vascularization, the newly formed bone tissue may not survive, leading to graft failure. The article highlights the importance of vascularization and how techniques like cell co-culture of ADMSC and HUVEC, encapsulated within bioactive hydrogels, and integrated with 3D-printed PCL/HAp scaffolds, aim to address this challenge by promoting the formation of capillary-like networks within the bone grafts.

3

What is the role of 3D printing in this bone regeneration process?

3D printing is utilized to create porous bone scaffolds, most often using PCL/HAp, which mimic the natural bone structure. This provides a physical framework that supports cell attachment and growth, which encourages bone regeneration. The precision of 3D printing allows for the creation of scaffolds with specific shapes and sizes, which is crucial for treating large bone defects. The scaffolds are then coated with bioactive hydrogels. These hydrogels, which encapsulate ADMSC and HUVEC, act as a delivery system, releasing cells into the scaffold and promoting vascularization and osteogenesis. This integrated approach of 3D printing and hydrogels ensures that the construct not only provides structural support but also actively promotes the biological processes of bone healing.

4

What is the significance of bioactive hydrogels in this process?

Bioactive hydrogels, such as those made from hyaluronic acid (HA) and gelatin, play a critical role by providing a supportive environment for the encapsulated ADMSC and HUVEC. These hydrogels mimic the extracellular matrix, encouraging cell attachment, proliferation, and differentiation. They facilitate the interaction of the cells, promoting the formation of capillary-like networks, which is essential for vascularization. They also release cells into the scaffold environment. The use of bioactive hydrogels enhances the overall effectiveness of the bone regeneration process, by creating a favorable environment for the cells and promoting vascularization.

5

What are the potential implications for the future of bone defect treatments?

The implications for the future of bone defect treatments are significant. The study's findings suggest that prevascularized 3D-printed scaffolds can be used for healing larger bone defects. By combining 3D printing with bioactive hydrogels and cell co-culture, researchers can create constructs that not only provide structural support but also actively promote vascularization and integration with the host tissue. This approach has the potential to revolutionize treatments for large bone defects. This can lead to improved patient outcomes by accelerating the healing process and enhancing the success rate of bone grafting procedures. This could reduce recovery times and improve the quality of life for individuals with bone injuries or diseases.

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