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Using a patterned microtexture to reduce polyethylene wear in metal-on-polyethylene prosthetic bearing couples
A Borjali1, J Langhorn2, K Monson1
1Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Wear : an International Journal on the Science and Technology of Friction Lubrication and Wear
|January 24, 2018
Summary
Adding microtexture dimples to metal hip implants significantly reduces polyethylene wear. This innovation promotes a lubricant film, decreasing friction and improving prosthetic longevity.
Area of Science:
- Biomaterials Science
- Orthopedic Engineering
- Tribology
Background:
- Metal-on-polyethylene hip implants are prone to wear and osteolysis.
- Current strategies focus on improving polyethylene or surface smoothness.
- Reducing wear is crucial for extending prosthetic joint lifespan.
Purpose of the Study:
- To investigate the effect of patterned microtexture on CoCrMo alloy surfaces on polyethylene wear.
- To evaluate the potential of microtexturing to reduce friction and wear in hip implants.
Main Methods:
- Pin-on-disc tribometry was used to measure polyethylene pin wear.
- Gravimetric analysis quantified wear for different polyethylene materials and microtexture geometries.
- Surface topography measurements correlated wear with contact reduction.
Main Results:
- Microtextured CoCrMo surfaces significantly reduced polyethylene wear compared to polished surfaces.
- The microtexture promoted elastohydrodynamic lubricant film formation.
- Reduced contact between articulating surfaces was confirmed by surface topography.
Conclusions:
- Patterned microtexture on CoCrMo femoral heads is a promising strategy to reduce polyethylene wear in hip implants.
- This approach enhances lubrication and minimizes articulating surface contact.
- Microtexturing offers a novel method to improve the longevity of metal-on-polyethylene bearings.
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