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Journal of Bone and Joint Surgery - British Volume, Vol 91-B, Issue 11, 1443-1447.
doi: 10.1302/0301-620X.91B11.22368  
Copyright © 2009 by British Editorial Society of Bone and Joint Surgery
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Ten-year follow-up of the non-porous Allofit cementless acetabular component

P. Zenz, MD, Orthopaedic Surgeon1; J. B. Stiehl, MD, Orthopaedic Surgeon2; H. Knechtel, MD, Orthopaedic Surgeon1; G. Titzer-Hochmaier, MD, Orthopaedic Surgeon1; and W. Schwagerl, MD, Orthopaedic Surgeon, Professor1

1 Orthopaedic Centre, OttoWagnerSpital, Sanatoriumstrass 2, A-1140 Wien, Austria.
2 St. Mary’s Hospital, Centralia Illinois, 4573, CJ Heck Road, Salem, Illinois 62881, USA.

Correspondence should be sent to Dr J. B. Stiehl; e-mail: jbstiehl{at}me.com

Cementless acetabular fixation has demonstrated superior long-term durability in total hip replacement, but most series have studied implants with porous metal surfaces. We retrospectively evaluated the results of 100 consecutive patients undergoing total hip replacement where a non-porous Allofit component was used for primary press-fit fixation.

This implant is titanium alloy, grit-blasted, with a macrostructure of forged teeth and has a biradial shape. A total of 81 patients (82 hips) were evaluated at final follow-up at a mean of 10.1 years (8.9 to 11.9). The Harris Hip Score improved from a mean 53 points (23 to 73) pre-operatively to a mean of 96 points (78 to 100) at final review. The osseointegration of all acetabular components was radiologically evaluated with no evidence of loosening. The survival rate with revision of the component as the endpoint was 97.5% (95% confidence interval 94 to 100) after 11.9 years. Radiolucency was found in one DeLee-Charnley zone in four acetabular components. None of the implants required revision for aseptic loosening. Two patients were treated for infection, one requiring a two-stage revision of the implant. One femoral stem was revised for osteolysis due to the production of metal wear debris, but the acetabular shell did not require revision.

This study demonstrates that a non-porous titanium acetabular component with adjunct surface fixation offers an alternative to standard porous-coated implants.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General