Does an enhanced surface finish improve acetabular fixation in revision total hip arthroplasty?
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.
Jamieson
Miranda L
ML
Institute of Orthopedic Research and Education, Houston, Texas, USA.
Russell
Robert D
RD
Incavo
Stephen J
SJ
Noble
Philip C
PC
D000077:Acetabulum / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods*; D002102:Cadaver; D006622:Hip Prosthesis; D006801:Humans; D008670:Metals; D008953:Models, Anatomic; D016062:Porosity; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation
D008670:Metals