Research on Cartilage 3D Printing Technology Based on SA-GA-HA

Cartilage damage is difficult to heal and poses a serious problem to human health as it can lead to osteoarthritis. In this work, we explore the application of biological 3D printing to manufacture new cartilage scaffolds to promote cartilage regeneration. The hydrogel made by mixing sodium alginate (SA) and gelatin (GA) has high biocompatibility, but its mechanical properties are poor. The addition of hydroxyapatite (HA) can enhance its mechanical properties. In this paper, the preparation scheme of the SA-GA-HA composite hydrogel cartilage scaffold was explored, the scaffolds prepared with different concentrations were compared, and better formulations were obtained for printing and testing. Mathematical modeling of the printing process of the bracket, simulation analysis of the printing process based on the mathematical model, and adjustment of actual printing parameters based on the results of the simulation were performed. The cartilage scaffold, which was printed using Bioplotter 3D printer, exhibited useful mechanical properties suitable for practical needs. In addition, ATDC-5 cells were seeded on the cartilage scaffolds and the cell survival rate was found to be higher after one week. The findings demonstrated that the fabricated chondrocyte scaffolds had better mechanical properties and biocompatibility, providing a new scaffold strategy for cartilage tissue regeneration.

Automated summary

In this study, the application of biological 3D printing in manufacturing new cartilage scaffolds for cartilage regeneration was explored. The addition of hydroxyapatite (HA) enhanced the mechanical properties of the hydrogel made from sodium alginate (SA) and gelatin (GA). Different concentrations of SA-GA-HA composite hydrogel cartilage scaffolds were prepared, and better formulations for printing and testing were obtained. The printed cartilage scaffold showed useful mechanical properties and higher cell survival rate after one week, suggesting that it provides a new scaffold strategy for cartilage tissue regeneration.