The early- to medium-term results of a hemispherical, porous coated acetabular shell with multiple different bearing com
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ORIGINAL PAPER
The early- to medium-term results of a hemispherical, porous coated acetabular shell with multiple different bearing combinations are excellent with the exception of metal-on-metal Zoe Thompson 1 & Amir Khoshbin 2 & Sarah Ward 2 & James P. Waddell 2 & Amit Atrey 2 Received: 4 August 2020 / Accepted: 15 September 2020 # SICOT aisbl 2020
Abstract Purpose This study prospectively reports survivorship and radiographic and clinical outcomes following primary elective total hip arthroplasty (THA) using a novel single hemispherical, porous-coated acetabular cup with five different bearing combinations and a minimum of five year follow-up. Methods Continuing post-market release monitoring of this cup, we prospectively enrolled 108 patients (121 THA) between 2009 and 2015. We followed this cohort by examining survivorship, in addition to clinical and radiological outcomes for metalon-metal (MoM) compared with non-MoM bearing combinations (ceramic-on-ceramic, oxinium-on-polyethylene, ceramic-onmetal, and metal-on-polyethylene). Results All 108 (121 hips) patients were followed up. Average age at time of surgery was 45.1 years (range 19 to 71 years) of which 42.1% were males. A total of seven (5.8%) cups were revised, all of which were MoM. No osteolysis was observed in any of the patients at the latest visit with a mean follow-up of 9.1 ± 1.7 years (range 4.4– 10.7 years). With MoM excluded, survivorship of the cup at five years is 97.8%. Survivorship for MoM implants was 90.0%. Validated hip scores showed significant improvements for all bearing types and no significant difference between groups at latest follow-up (p = 0.614). There was no cup migration with any bearing surface. Conclusion This cup showed excellent survivorship at five year follow-up, except for patients receiving a MoM articulation. While there were concerns over the early survivorship of this cup, our cohort and joint registry data confirm excellent outcomes. Keywords Hip arthroplasty . Acetabular component . Survivorship . Articulation . Modular
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00264-020-04817-1) contains supplementary material, which is available to authorized users. * Amit Atrey [email protected] Zoe Thompson [email protected] Amir Khoshbin [email protected] Sarah Ward [email protected] James P. Waddell [email protected] 1
University of Toronto, 27 King’s College Cir, Toronto, ON M5S, Canada
2
St. Michael’s Hospital, University of Toronto, 30 Bond St., Toronto, ON M5B 1W8, Canada
Introduction The uncemented R3 Acetabular system (Smith & Nephew, Memphis, TN) for total hip arthroplasty (THA) was developed in 2007 [1]. The cup is a hemispherical design with a proprietary porous coating (StikTite) to increase the coefficient of friction. It has a passive liner locking mechanism and was developed to accommodate three potential bearing surface liners (cobalt chrome [CoCr], highly cross-linked polyethylene [XLPE] and ceramic).
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