Comparison of one-step and sequentially irradiated ultrahigh-molecular-weight polyethylene for total joint replacements

2012 ◽  
pp. n/a-n/a
Author(s):  
Miroslav Slouf ◽  
Jiri Kotek ◽  
Josef Baldrian ◽  
Jana Kovarova ◽  
Jaroslav Fencl ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Joint Replacements ◽  
Total Joint Replacements ◽  
Ultrahigh Molecular Weight ◽  
One Step

Bio-mimetic study of novel materials for joint replacements

2005 ◽  
Vol 898 ◽  
Author(s):  
Rahul Ribeiro ◽  
Poulomi Ganguly ◽  
Donald Darensbourg ◽  
Meitin Usta ◽  
A. Hikmet Ucisik ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Simulated Body Fluid ◽  
Boundary Lubrication ◽  
Body Fluid ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Biocompatible Polymers ◽  
Friction Coefficients ◽  
Joint Replacements ◽  
Hydrophilic Surfaces ◽  
Ultrahigh Molecular Weight

AbstractPolytrimethylene carbonate (PTMC) and poly ε-caprolactone are conventional biodegradable, biocompatible polymers. Their friction response against cartilage and surface attraction forces were studied toward using them as artificial cartilage materials. Their behavior was compared to that of natural cartilage and a conventional joint replacement material, ultrahigh molecular weight polyethylene. It was possible to polymerize these materials using a calcium based catalyst. Simulated body fluid (SBF) was used as lubricant between surfaces in the friction tests. It was found that higher surface attractive forces on a silicon tip AFM related to lower friction coefficients. This confirs the fact that hydrophilic surfaces enhance the effectiveness of boundary lubrication of simulated body fluid. PTMC and PTMC-ε-caprolactone co-polymer showed lower hydrophilicity and higher friction coefficients and need to be modified in order to bring them closer in behavior to natural cartilage.

Study on Bio-Tribological Properties of Nitrogen Ion Implanted UHMWPE

2005 ◽  
Vol 288-289 ◽  
pp. 649-652 ◽  
Author(s):  
Dang Sheng Xiong
Keyword(s):  
Wear Rate ◽  
Blood Plasma ◽  
Polyethylene Wear ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Implantation Dose ◽  
Joint Replacements ◽  
Total Joint Replacements ◽  
Ultrahigh Molecular Weight ◽  
Lubrication Condition ◽  
Nitrogen Ion

As the aseptic loosening induced by polyethylene wear debris is the main cause of long-term failure of total joint replacements, increasing the wear resistance of ultrahigh molecular weight polyethylene (UHMWPE) will be very important to obtain long-life artificial joint. In this paper the UHMWPE was implanted with 450 keV N+ ions to three doses of 5×1014/cm2, 2.5×1015/cm2 and 1.25×1016/cm2. The friction and wear behaviors of UHMWPE were studied under lubrication of distilled water and blood plasma using a ball-on-disk tribometer with a ZrO2 ceramic ball as a counterface. Experimental results showed that the friction coefficient of ions implanted UHMWPE are higher than un-implanted UHMWPE. Under blood plasma lubrication condition, the wear rate of implanted UHMWPE was lower than un-implanted UHMWPE, and the wear rate decreased with increasing implantation dose. The plow, plastic deformation and fatigue were wearing mechanism for un-implanted UHMWPE and the abrasive wear for implanted UHMWPE.

Sign in / Sign up

Export Citation Format

Share Document