Novel 3D-printing bilayer GelMA-based hydrogel containing BP, β-TCP and exosomes for cartilage–bone integrated repair

experiments have confirmed that the bi-layer scaffolds can promote osteogenesis and chondrogenic differentiation respectively. And in the rabbit cartilage-bone injury model, MRI and micro-CT results show that the 3D printed bi-layer GelMA composite scaffold has a repair effect close to normal tissue.