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misinterpreted as a tumor. Without treatment, a low-impact completed fracture will likelyoccur.Many bisphosphonate-associated impending subtrochanteric femoral stress fractures aremisdiagnosed as trochanteric bursitis, leading to subsequent displaced subtrochanteric fractures[Fig. 2 - Note subtle impending fracture lesion on right, completed fracture on left]. The clinicaland subtle radiographic findings must be recognized by orthopaedic surgeons, particularly hipsurgeons, to prevent these complete fractures. These fractures are preventable with internalfixation. Long-term administration of bisphosphonates can have adverse effects, andalternatives to long-term continuous dosing must be investigated to determine optimaladministration regimens.FiguresFigure 1 Figure 2Friday, October 8, 2010, 8:00-8:30Session A10: Bearings and TribologyMetal Bearings in Hip Arthroplasty – What Have We Learned?*Chris Whately - Medcare Hospital - Dubai, United Arab Emirates*Email: chriswhately@hotmail.comMetal Bearings in Hip Arthroplasty – What Have We Learned?Large metal on metal bearings have come back to hip arthroplasty the past five to ten years withgreat promise to minimize wear debris, eliminate osteolysis, reduce dislocations and improverange of motion. While some of these claims have proven to be true, new problems havesurfaced that threaten the success of these devices. Metalosis, “pseudotumours” and ALVAL(aseptic lymphocytic vasculitis associated lesions) are appearing. These lesions produce painthat is difficult to confirm on routine exam and xray but eventually lead to early revisionsurgery.This paper will examine the advantages and complications of this hard bearing surface with aspecial look at complications, their prevention and management.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]