Fabrication of modified ultra-high molecular weight polyethylene via hybrid approaches for next-generation biomedical implants

Abstract

Ultra-high molecular weight polyethylene (UHMWPE) is widely used as a key material in biomedical implants such as artificial joints due to its exceptional wear resistance, high impact strength, and good biocompatibility. However, its inherent bio-inertness, hydrophobicity, risk of osteolysis induced by wear debris, and insufficient mechanical and processing properties severely limit its long-term clinical performance. This review systematically summarizes recent advances in the functional enhancement of UHMWPE via hybrid strategies, including surface modifications (e.g., coatings, chemical grafting, laser processing, plasma treatment) and bulk blending modifications (involving both organic and inorganic composites). These approaches have been shown to significantly improve wear resistance, bioactivity, hydrophilicity, and mechanical properties, while effectively suppressing oxidative degradation and inflammatory responses. The current challenges in modification technologies, such as balancing multiple properties, ensuring long-term biosafety, and achieving clinical translation, are also discussed. Finally, future directions toward multifunctional integration, intelligent responsiveness, and personalized customization of implants are outlined, providing critical insights for the development of next-generation high-performance and long-lasting biomedical materials.

Keywords

UHMWPE / surface modification / blending / biocompatibility / biomedical materials / implants

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