Lubricant in Metal-On-Metal Hip Implants Found to Be Graphite, Not Proteins

Researchers from Northwestern University, Evanston, IL, Rush University Medical Center, Chicago, and the University of Duisburg-Essen Germany found that graphitic carbon is a key element in a lubricating layer that forms on metal-on-metal hip implants. The lubricant is more similar to the lubrication of a combustion engine than that of a natural joint.

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