LAUSR

Background. Materials degrading after implantation into bone are in the field of actual vision of orthopediс surgeon. These materials include polylactides, which are the ideal material for creating bone implants in 3D-printer, especially implants of complex shapes and different sizes. The purpose of the study is to conduct a comparative analysis of bone remodeling under conditions of implantation of polylactide 3D-printed screws into metadiaphyseal and diaphyseal defects of the rat femur. Materials and methods. Comparative analysis of bone remodeling under conditions of implantation of polylactide Ingeo™ Biopolymer 4032D 3D-printed screws into the metadiaphyseal and diaphyseal defects of the rat femur for 15, 30, 90, 180 and 270 days are conducted. After implantation of polylactide, areas of bone with implants were examined by the histological method with the determination of the osteointegration index. Results. It was found that for all the study periods the implants kept their shape, were surrounded by bone tissue. The osseointegration index on the 270th day in metadiaphyseal and diaphyseal defects is 97.1 and 94.3 %, respectively, and is statistically higher compared to the 15th day by 2.2 and 2.3 times (p < 0.001). Conclusions. The polylactide-based Ingeo™ Biopolymer 4032D implants are biocompatible, have high osteointegration qualities, do not cause inflammation in the surrounding soft tissues and bone marrow, do not lead to destructive changes of the bone in the implantation sites. At the end of the study (270 days), the degradation of polylactide is not found, which makes it possible to use it for fixation or filling cavities in compact and spongy bones for a long time.