Bone and skeletal injuries are a major cause of long-term disability worldwide. Researchers at Sweden’s Lund University have developed a cell-free cartilage structure designed to guide the body in repairing damaged bone.
Research shows that this artificial graft can promote bone healing without triggering a strong immune response. The method has already been successfully tested in animal models, and researchers are preparing to evaluate the approach in human studies.
Large bone injuries often require a graft.
When large sections of bone are destroyed or removed, the body may have a hard time repairing the damage on its own. This can occur after cancer treatment, severe joint diseases such as rheumatoid arthritis or osteoarthritis, or severe infections. In these cases, bone tissue grafting is often required to restore structure and function.
Researchers estimate that more than 2 million people worldwide require bone graft surgery each year. Current treatments typically rely on using the patient’s own tissue or cells to rebuild bone. Although this approach may be effective, it is expensive, time-consuming, and can add to the physical burden that patients already face. Researchers say it also contributes to rising medical costs.
Aiming for universal bone repair technology
“Patient-specific transplants are expensive, time-consuming, and not always successful. A universal approach in tissue engineering with a reproducible manufacturing process has great advantages. Our study presents just such an approach and demonstrates an important advance towards non-patient-specific techniques,” says Alejandro García García, Associate Researcher in Molecular Skeletal Biology at Lund University.
To develop this new method, the team first cultured cartilage tissue in the laboratory. All living cells were then removed from it in a process called decellularization. This step leaves behind the extracellular matrix, a natural framework that surrounds the cells within the tissue and provides both structural support and biological signals.
This framework remains intact and contains growth factors that can guide the body’s own cells. Once placed at the site of injury, the remaining cartilage structure acts like a blueprint to help the body gradually rebuild the damaged bone.
Prefabricated cartilage grafts for bone repair
“The cartilage construct we have developed is based on stable, well-controlled, and reproducible cell lines that can stimulate bone formation without triggering a strong immune response. “We have shown that it is possible to create an ‘off-the-shelf’ graft. We believe this will be an important step towards the future clinical use of human bone tissue grafts, as the material can be produced and stored in advance.” The person who led the research. He is an associate professor and researcher in molecular skeletal biology at Lund University.
Preparation for human clinical trials
One important advantage of this technique is that the cartilage scaffold can be prefabricated and used for many patients without individualization. The next stage of research will focus on evaluating the method in humans while scaling up and standardizing production.
“The next step is to decide which types of injuries to test first, such as severe defects in the long bones of the arms or legs. At the same time, we need to develop the documentation necessary for ethical review and regulatory approval to conduct clinical trials. In parallel, we are establishing a manufacturing process that can be performed on a larger scale while maintaining the same high level of quality and safety every time,” said Alejandro García García.
