Radiostereometric analysis and clinical outcomes of a novel reverse total hip system at two years.

Content Provider	Europe PMC
Author	Turgeon, Thomas R. Hedden, David R. Bohm, Eric R. Burnell, Colin D.
Copyright Year	2023
Abstract	AimsInstability is a common cause of failure after total hip arthroplasty. A novel reverse total hip has been developed, with a femoral cup and acetabular ball, creating enhanced mechanical stability. The purpose of this study was to assess the implant fixation using radiostereometric analysis (RSA), and the clinical safety and efficacy of this novel design.MethodsPatients with end-stage osteoarthritis were enrolled in a prospective cohort at a single centre. The cohort consisted of 11 females and 11 males with mean age of 70.6 years (SD 3.5) and BMI of 31.0 kg/m2 (SD 5.7). Implant fixation was evaluated using RSA as well as Western Ontario and McMaster Universities Osteoarthritis Index, Harris Hip Score, Oxford Hip Score, Hip disability and Osteoarthritis Outcome Score, 38-item Short Form survey, and EuroQol five-dimension health questionnaire scores at two-year follow-up. At least one acetabular screw was used in all cases. RSA markers were inserted into the innominate bone and proximal femur with imaging at six weeks (baseline) and six, 12, and 24 months. Independent-samples t-tests were used to compare to published thresholds.ResultsMean acetabular subsidence from baseline to 24 months was 0.087 mm (SD 0.152), below the critical threshold of 0.2 mm (p = 0.005). Mean femoral subsidence from baseline to 24 months was -0.002 mm (SD 0.194), below the published reference of 0.5 mm (p < 0.001). There was significant improvement in patient-reported outcome measures at 24 months with good to excellent results.ConclusionRSA analysis demonstrates excellent fixation with a predicted low risk of revision at ten years of this novel reverse total hip system. Clinical outcomes were consistent with safe and effective hip replacement prostheses.Cite this article: Bone Jt Open 2023;4(5):385–392.
Related Links	https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC10206517&blobtype=pdf
Journal	Bone & Joint Open [Bone Jt Open]
Volume Number	4
PubMed Central reference number	PMC10206517
Issue Number	5
PubMed reference number	37222043
e-ISSN	26331462
DOI	10.1302/2633-1462.45.bjo-2023-0018.r1
Language	English
Publisher	The British Editorial Society of Bone & Joint Surgery
Publisher Date	2023-05-24
Publisher Place	London
Access Restriction	Open
Rights License	This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (CC BY-NC-ND 4.0) licence, which permits the copying and redistribution of the work only, and provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc-nd/4.0/ © 2023 Author(s) et al.
Subject Keyword	Reverse total hip Fixation Instability Primary clinical outcomes radiostereometric analysis (RSA) Hip hip arthroplasty patient-reported outcome measures (PROMs) t-tests end-stage osteoarthritis Western Ontario and McMaster Universities Osteoarthritis Index acetabular screws total hip arthroplasty (THA)
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Surgery