Abstract
IntroductionThe most common cause of failure in total hip arthroplasty (THA) is aseptic loosening. Uncemented cup migration analysis by EBRA (Einzel-Bild-Roentgen-Analyse) has shown to be a good predictive indicator for early implant failure if the cup migrates more than 1 milimeter (mm) within the first 2 years after surgery. In this study, we investigated the migration behaviour of an uncemented press-fit cup after 2 years follow-up.Materials and methodsApplying a retrospective study design, we reviewed all consecutive patients who received an uncemented press-fit cup at our Department between 2013 and 2018. A total of 484 patients were identified. We reviewed medical histories and performed radiological measurements using EBRA-Cup software. EBRA measurements and statistical investigations were performed by two independent investigators.ResultsA total of 165 cups in 159 patients (female: 90; male: 69) met our inclusion criteria. Mean age at surgery was 66.7 (range 18.4–90.5) years. EBRA migration analysis showed a mean total migration of 0.7 mm (range 0.0–6.3) over our follow-up period of 2 years. Of the investigated cups, 53.2% showed less than 1 mm migration in the investigated follow-up period.ConclusionIn conclusion, the Pinnacle cup used in our study provides low mean migration at final follow-up. Based on the assumption of secondary stabilization, good long-term outcome of the Pinnacle cup can be expected.Trial registration number and date of registrationNumber: 20181024-1875; Date: 2018-09-20
Highlights
The most common cause of failure in total hip arthroplasty (THA) is aseptic loosening
Published studies of uncemented cup migration investigated by means of EBRA (Einzel-Bild-Roentgen-Analyse) have shown this migration to be a good predictive indicator and threshold for later aseptic loosening [5,6,7,8]
A total of 484 Pinnacle cups were implanted as part of a primary THA
Summary
The most common cause of failure in total hip arthroplasty (THA) is aseptic loosening. Uncemented cup migration analysis by EBRA (Einzel-Bild-Roentgen-Analyse) has shown to be a good predictive indicator for early implant failure if the cup migrates more than 1 milimeter (mm) within the first 2 years after surgery. Published studies of uncemented cup migration investigated by means of EBRA (Einzel-Bild-Roentgen-Analyse) have shown this migration to be a good predictive indicator and threshold for later aseptic loosening [5,6,7,8]. EBRA is a computer-assisted method for measuring the migration of acetabular cups using standard anterior–posterior (ap) pelvic radiographs without requiring additional means at exposure (e.g. ball markers) [9] It has proven accuracy and sensitivity in detecting migration of more than 1 mm as compared to RSA (Roentgen stereophotogrammetric analysis) [10,11,12]. The method used is chosen by the surgeon and subject to patient age and bone quality
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