Daniel GODOY-MONZON, Agustin GARCIA-MANSILLA, Alberto Cid CASTEULANI, Santiago SVARZCHTEIN

Results of the Novation CrowncupTM porous-coated uncemented acetabular component in total hip arthroplasty: a 10-year clinical and radiological assessment

Objective: The aim of this study was to evaluate theclinical, radiological, and survivorship results of a porous-coated uncementedacetabularcup (Novation Crowncup TM Exactech, Gainesville, Florida, USA) in patientsundergoing total hip arthroplasty at themid to long term follow-up.Methods: We prospectively analyzed 185 consecutivetotal hip replacements in 176 patients during 2009. All the patients receivedaNovation Crowncup™ uncemented cup. All surgeries were performed by one ofthe 4 joint replacement specialists. Severalclinical and radiographic outcomemeasures were evaluated.Results: There was no cupmigration recorded. Six cups (5.2%) had a thin (less than 1 mm) radiolucentline without signs ofloosening or clinical manifestation, but under close followup. The wear was not significative at the end of the follow up. Themean HarrisHip Score increased from 45.7 (range = 28 to 65) preoperatively to 89.8 (range= 87 to 96) at the final follow-up.Subjectiveevaluation showed excellent results in 82.6%, good in 8.6%, fair in 5.9%, andpoor in 2.9% of the cases. Eight patients, 3stems, and 5 cups (5% of the series)were revised, the survival of the series was 95% when the failure was the needfor additionalacetabular or femoral revision surgery for any reason. If wedefine failure as the need for an acetabular revision for some reason,thesurvival was (97.5%). When we evaluated survival only for aseptic loosening ofthe cup at 10 years of follow-up, 98.4% of theimplants survived.Conclusion: In our series,when we evaluated survival only for aseptic loosening of the cup at 10 years offollow-up, 98.4% of theimplants survived. The Crowncup acetabular cup survivalrate was 97.5% including all causes of loosening and 95% including allcausesfor revision at 10 years of follow-up.Level of Evidence: Level IV, Therapeutic Study

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