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Results:We found a surprisingly high prevalence of lesions on MRI scan in the well functioning group(11 out 23, 48%) when compared to the painful group (79 out of 137, 57%). However, therewere a significantly greater number of grade 1 lesions in the well functioning group. Wesuggest that these are post-surgical changes and should not be confused with pathological,tissue destroying lesions.DiscussionThis is the largest ever study of patients with MARS MRI scans of MOM hips. It is the first touse a classification system and the first to compare well functioning with painful hips. We arenow able to provide radiologists and surgeons with clinical interpretation of a lesion on MRIscan. Our classification system will provide useful information on both symptomatic andasymptomatic patients. Longitudinal follow up of these patients will provide the final validation.Thursday, October 7, 2010, 9:00-9:50Session A2: Alternate Bearings in THA 2Synchrotron Xray Spectroscopy Reveals Chemical Form of in-HumanMetal-on-Metal Hip Wear Debris : Ultima and Current Generation HipsSummary*Alister Hart - Imperial College - London, UKPaul Quinn - Diamond - Harwell, UKJohn Nolan - Norwich - Norwich, UKKeith Tucker - Norwich - Norwich, UKJohn Skinner - Royal National Orthopaedic Hospital Trust - Stanmore, UKJonathan Powell - Cambridge - Cambridge, UKFerdinand Lali - Imperial College - London, UKFred Mosselmans - Diamond - Harwell, UK*Email: a.hart@imperial.ac.ukWe report the first use of synchrotron xray spectroscopy to characterize and compare thechemical form and distribution of metals found in tissues surrounding patients with metal-onmetalhip replacements that failed with (Ultima hips) or without (current generation, largediameter hips) corrosion.IntroductionThe commonest clinical category of failure of metal-on-metal (MOM) hip replacements is“unexplained” and commonly involved a soft tissue inflammatory response. The mechanism offailure of the Ultima MOM total hip replacement includes severe corrosion of the metal stemand was severe enough to be removed from clinical use. Corrosion is not a feature that we havefile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]