Ten-year follow-up of the non-porous Allofit cementless acetabular component

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

Journal of Bone and Joint Surgery - British Volume, Vol 91-B, Issue 11, 1443-1447

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.

• Results With the Cementless Spotorno Stem in Total Hip Arthroplasty
• Third-Generation Ceramic-on-Ceramic Bearing Surfaces in Revision Total Hip Arthroplasty
• Corrosion of a Hip Stem With a Modular Neck Taper Junction
• Elevated Serum Concentrations of Cobalt, Chromium, Nickel, and Manganese After Metal-On-Metal Alloarthroplasty of the Hip
• Long-term Results for the Uncemented Zweymuller/Alloclassic Hip Endoprosthesis
• In Vivo Wear Rate of the Birmingham Hip Resurfacing Arthroplasty
• The management of severe acetabular bone defects in revision hip arthroplasty using modular porous metal components
• Cementation of a Polyethylene Liner Into a Metal Acetabular Shell
• Blood metal ion concentrations after hip resurfacing arthroplasty
• Migration of the Trabecular Metal Monoblock Acetabular Cup System
• Risk factors for inflammatory pseudotumour formation following hip resurfacing
• Primary Total Hip Arthroplasty With Duraloc Cup in Patients Younger Than 50 Years
• Ten-year follow-up of the non-porous Allofit cementless acetabular component
• Ceramic-on-ceramic bearing surface and risk of revision due to dislocation after primary total hip replacement

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