"Graphite carbon is a key element in the lubricating layer that forms on metal-on-metal hip implants. The lubricant has more in common with the lubrication of a combustion engine than that of a natural joint."
- research is relevant to several hundred thousand Americans undergo hip replacement each year
- typical life of implant is more than 10 years but material improvement is needed for patients younger than age 60
- prior to this study, it was thought that proteins from the body entered the joint and adhered to the implant