TY  - JOUR
T1  - A Survey on the Prevalence of Pseudotumors with Metal-on-Metal Hip Resurfacing in Canadian Academic Centers
AU  - Beaulé, Paul E.
AU  - , 
Y1  - 2011/05/04
N1  - 10.2106/JBJS.J.01848
JO  - The Journal of Bone & Joint Surgery
SP  - 118
EP  - 121
VL  - 93
IS  - Supplement_2
N2  - Background: 
  Metal-on-metal bearings for hip arthroplasty have been in clinical use for over twenty years with excellent clinical results reported worldwide. A small percentage (<1%) of patients have developed an inflammatory response, and a more severe inflammatory response termed pseudotumor has been more recently reported. The primary purpose of this study was to determine the prevalence of pseudotumor following metal-on-metal hip resurfacing in Canadian academic centers.Methods: 
  Nine of the fourteen centers that perform metal-on-metal hip resurfacings were surveyed. The number of metal-on-metal hip resurfacing arthroplasties performed at each center was determined, as was the number of patients who presented with a pseudotumor and subsequently required revision hip surgery between 2002 and December 2008.Results: 
  At the nine centers, 3432 hip resurfacing arthroplasties were performed; 76.9% of the patients were male, the mean age was 51.2 years (range, sixteen to eighty-three years), and the mean body-mass index was 28.1 (range, 17 to 55). The mean length of follow-up was 3.4 years (range, two to nine years). A pseudotumor developed after four of the 3432 arthroplasties, for a prevalence of 0.10%.Conclusions: 
  Although pseudotumors remain a concern after metal-on-metal hip resurfacing, the prevalence at short to midterm follow-up is very low in this multicenter survey. Continued close monitoring is required to determine what clinical factors are involved with the uncommon pseudotumor formation.Level of Evidence: 
  Therapeutic Level IV. See Instructions to Authors for a complete description of levels of evidence.
SN  - 0021-9355
M3  - doi: 10.2106/JBJS.J.01848
UR  - http://dx.doi.org/10.2106/JBJS.J.01848
ER  -