Does an enhanced surface finish improve acetabular fixation in revision total hip arthroplasty?

Authors:
Robert D Russell
Robert D Russell
University of Texas Southwestern Medical Center
Dallas | United States
Stephen J Incavo
Stephen J Incavo
Houston Methodist Hospital
Houston | United States
Philip C Noble
Philip C Noble
Institute of Orthopedic Research and Education
United States

J Arthroplasty 2011 Jun 20;26(4):644-8. Epub 2010 Jul 20.

Institute of Orthopedic Research and Education, Houston, Texas, USA.

High-porosity "cancellous metal" coatings have been introduced to increase the fixation and biologic incorporation of acetabular cups. The strength of initial fixation provided by a cancellous metal cups vs conventional alternatives in the deficient revision acetabulum was investigated. Cancellous, plasma-sprayed, and beaded cups (n = 9) were implanted under controlled conditions into a validated model of the revision acetabulum. The greatest differences were seen in resistance to catastrophic (spin-out) failure that, for the cancellous shell, averaged 1076 ± 265 N, which was 25% greater than the plasma-sprayed implant (859 ± 214 N, P = .04) and 218% greater than the beaded implant (338 ± 123 N, P < .01). The cancellous coating also provided greater resistance to ultimate failure. These results suggest that these new cancellous metal coatings may represent a promising alternative for fixation in revision total hip arthroplasty.

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http://dx.doi.org/10.1016/j.arth.2010.05.016DOI Listing

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June 2011
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