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 uncemented acetabularcup (Novation Crowncup TM Exactech, Gainesville, Florida, USA) in patientsundergoing total hip arthroplasty at the mid to long term follow-up. METHODS Weprospectively analyzed 185 consecutivetotal hip replacements in 176 patients during 2009. All the patients received aNovation Crowncup™ uncemented cup. All surgeries were performed by one ofthe 4 joint replacement specialists. Several clinical 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 of loosening or clinical manifestation, but under close followup. The wear was not significative at the end of the follow up. The mean 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, 3 stems, and 5 cups (5% of the series)were revised, the survival of the series was 95% when the failure was the needfor additional acetabular 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 the implants survived. CONCLUSION In our series,when we evaluated survival only for aseptic loosening of the cup at 10 years offollow-up, 98.4% of the implants survived. The Crowncup acetabular cup survivalrate was 97.5% including all causes of loosening and 95% including all causesfor revision at 10 years of follow-up. LEVEL OF EVIDENCE Level IV, Therapeutic Study.