Porous tantalum shells and augments for acetabular cup revisions
Andrej Moličnik1, Marko Hanc, Gregor Rečnik
1Department of Orthopeadics, University Clinical Centre Maribor, Ljubljanska 5, 2000, Maribor, Slovenia/EU.
Purpose:
The purpose of this study was to evaluate early functional results of revision hip arthroplasty with pelvic bone loss revised with porous tantalum (PT) acetabular components.
Methods:
Twenty-five consecutive patients (25 hips) with loose acetabular components after total hip arthroplasty with a minimum of Paprosky IIa pelvic bone loss treated with PT cups with and without modular augments were retrospectively reviewed. Clinical outcomes were assessed using Harris hip score, and Western Ontario and McMaster Universities scores. Mean follow-up was 20.5 months and no patient was lost during follow-up.
Results:
The average Harris hip score, and Western Ontario and McMaster Universities scores improved from 40 and 36 preoperatively to 79 and 73 postoperatively, respectively. No statistically significant differences in functional outcome scores were found between the group with moderate (Paprosky IIa, b) and severe (Paprosky IIc or more) acetabular bone loss. At the most recent radiographic evaluation, 24 cups demonstrated no lucent lines and 1 cup had lucent lines but remained well fixed. One cup was revised for traumatic dislocation but was found well fixed at open reduction. There were no septic or aseptic failures in this series.
Conclusion:
While awaiting longer-term follow-up studies, trabecular metal components show sufficient primary stability and appear suitable for revision hip arthroplasty with acetabular bone loss.
