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A randomized trial comparing acetabular component fixation of two porous ingrowth surfaces using RSA
Douglas D R Naudie1, Lyndsay Somerville, Abigail Korczak
1Imaging Research Laboratories, Robarts Research Institute, London, ON, Canada; Department of Surgery (Orthopaedics), Western University, London, ON, Canada.
The Journal of Arthroplasty
|August 20, 2013
Summary
Both high and low porosity cementless acetabular components demonstrated excellent biologic fixation in total hip arthroplasty (THA) patients. Radiostereometric analysis (RSA) confirmed effective in vivo fixation for both porous ingrowth surfaces.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Medical Imaging
Background:
- Acetabular component fixation is crucial for total hip arthroplasty (THA) success.
- Porous ingrowth surfaces aim to enhance biologic fixation and implant stability.
- Advancements in porous surface technology offer new options for cementless acetabular components.
Purpose of the Study:
- To compare the in vivo biologic fixation of two distinct porous ingrowth surfaces for cementless acetabular components.
- To evaluate the efficacy of a high porosity titanium surface versus a low porosity sintered bead surface.
- To assess fixation stability using radiostereometric analysis (RSA) in primary THA.
Main Methods:
- A randomized controlled trial involving 62 patients undergoing primary THA.
- Comparison of a 61% high porosity asymmetric titanium surface (StikTite) against a 45% low porosity sintered bead surface (Roughcoat).
- Radiostereometric analysis (RSA) and clinical follow-up at multiple intervals up to 2 years post-operatively.
Main Results:
- Both the high porosity StikTite and the lower porosity Roughcoat surfaces achieved excellent biologic fixation.
- Radiostereometric analysis (RSA) indicated stable fixation for both types of porous ingrowth surfaces.
- Clinical follow-up examinations supported the findings of effective in vivo fixation.
Conclusions:
- Both high and low porosity cementless acetabular components provide excellent biologic fixation in THA.
- The choice between these specific porous surfaces does not appear to compromise initial in vivo fixation.
- Further research may explore long-term outcomes and differential wear characteristics.
