[Materials for hip endoprostheses--alternatives to standard materials]

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Materials Engineering

Background:

• Current hip prostheses utilize materials like ultra-high-molecular-weight polyethylene (UHMWPE), cobalt-chromium-molybdenum (CoCrMo) alloys, alumina, and zirconia.
• UHMWPE is identified as the weakest link in the material chain due to wear resistance limitations.
• Advancements in metallic and ceramic materials have surpassed traditional UHMWPE performance.

Purpose of the Study:

• To review clinically applied biomaterials for hip prostheses, focusing on wear resistance.
• To present and compare alternative materials and techniques for improving tribological properties.
• To evaluate the advantages, disadvantages, and prospects of novel materials against standard options.

Main Methods:

• Literature review of current and emerging biomaterials for hip implants.
• Analysis of wear resistance in ultra-high-molecular-weight polyethylene (UHMWPE), metal alloys, and ceramics.
• Description of new surface hardening, coating techniques, and composite materials.

Main Results:

• Ultra-high-molecular-weight polyethylene (UHMWPE) exhibits inferior wear resistance compared to advanced metallic and ceramic options.
• New materials including surface-hardened titanium alloys, polymer coatings, optimized UHMWPE, and carbon-fiber composites show promise.
• Experimental and clinical studies document the performance of these alternative materials.

Conclusions:

• Ultra-high-molecular-weight polyethylene (UHMWPE) requires improvement or replacement in hip prostheses to enhance longevity.
• Novel biomaterials and surface modification techniques offer significant potential for improving the wear performance of hip implants.
• Further research and clinical validation are essential for the successful integration of advanced materials in total hip replacements.