3D printed PCU/UHMWPE polymeric blend for artificial knee meniscus

摘要

3D printing was used to fabricate porous polycarbonate-urethane (PCU) and ultra-high-molecular-weight polyethylene (UHMWPE) blend for the artificial meniscus to enable native lubrication mechanisms of the knee. 3D printed PCU and molded PCU and UHMWPE were used for comparison. Cross-sectional images of 3D printed PCU and PCU/UHMWPE blend showed 6.34% and 13.61% porosity, respectively, while no porosity was observed in molded samples. This porosity leads to 46% more fluid absorbed by 3D printed PCU than molded PCU. Rotational oscillating tests under conditions replicating the knee motion show 3D printed PCU has 27% less wear depth than molded PCU due to retained fluid in its porosity. Thus, 3D printing provides a facile approach to fabricate porous, customizable PCU implants that mimic meniscus lubrication.