Researchers at Lund University in Sweden have created a cell-free cartilage scaffold that guides the body to repair damaged bone. The innovation, tested successfully in animal models, avoids strong immune reactions and offers a universal alternative to patient-specific grafts. Plans are underway to test it in human clinical trials.
Bone and skeletal injuries often lead to long-term disability worldwide, particularly in cases involving cancer treatment, severe joint diseases like rheumatoid arthritis and osteoarthritis, or serious infections. When large bone sections are damaged, the body may not repair them naturally, necessitating transplants. Each year, more than two million people undergo bone graft procedures globally.
Traditional methods rely on a patient's own tissue or cells, which prove expensive, time-intensive, and physically demanding. They also drive up healthcare costs. To address these issues, scientists at Lund University engineered a cartilage scaffold through decellularization: they grew cartilage tissue in the lab and removed all living cells, preserving the extracellular matrix. This matrix retains structural support and natural growth factors that signal the body to rebuild bone.
Placed at injury sites, the scaffold serves as a blueprint for regeneration without triggering significant immune responses. In animal studies, it effectively repaired large bone defects. "Patient-specific grafts are both costly and time-consuming and do not always succeed. A universal approach in tissue engineering, with a reproducible manufacturing process, offers major advantages," said Alejandro Garcia Garcia, an associate researcher in molecular skeletal biology at Lund University.
The scaffold uses stable cell lines for consistent production, enabling 'off-the-shelf' availability. It can be made in advance, stored, and used across patients without customization. "The cartilage structure we have developed is based on stable, well-controlled and reproducible cell lines, and can stimulate bone formation without triggering strong immune reactions. We show that it is possible to create a ready-made... graft that... can repair large bone defects," explained Paul Bourgine, the study's lead researcher and an associate professor at Lund University.
Future efforts will standardize large-scale manufacturing and prepare for ethical and regulatory approvals. Initial human trials may target severe defects in long bones of the arms and legs.
