Early outcomes after robotic arm-assisted bi-unicompartmental knee arthroplasty compared with total knee arthroplasty: a prospective, randomized controlled trial

Blyth, M. J. G., Banger, M. S., Doonan, J. , Jones, B. G., MacLean, A. D. and Rowe, P. J. (2021) Early outcomes after robotic arm-assisted bi-unicompartmental knee arthroplasty compared with total knee arthroplasty: a prospective, randomized controlled trial. Bone and Joint Journal, 103-B(10), pp. 1561-1570. (doi: 10.1302/0301-620X.103B10.BJJ-2020-1919.R2) (PMID:34587803) (PMCID:PMC9948427)

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Abstract

Aims: The aim of this study was to compare the clinical outcomes of robotic arm-assisted bi-unicompartmental knee arthroplasty (bi-UKA) with conventional mechanically aligned total knee arthroplasty (TKA) during the first six weeks and at one year postoperatively. Methods: A per protocol analysis of 76 patients, 43 of whom underwent TKA and 34 of whom underwent bi-UKA, was performed from a prospective, single-centre, randomized controlled trial. Diaries kept by the patients recorded pain, function, and the use of analgesics daily throughout the first week and weekly between the second and sixth weeks. Patient-reported outcome measures (PROMs) were compared preoperatively, and at three months and one year postoperatively. Data were also compared longitudinally and a subgroup analysis was conducted, stratified by preoperative PROM status. Results: Both operations were shown to offer comparable outcomes, with no significant differences between the groups across all timepoints and outcome measures. Both groups also had similarly low rates of complications. Subgroup analysis for preoperative psychological state, activity levels, and BMI showed no difference in outcomes between the two groups. Conclusion: Robotic arm-assisted, cruciate-sparing bi-UKA offered similar early clinical outcomes and rates of complications to a mechanically aligned TKA, both in the immediate postoperative period and up to one year following surgery. Further work is required to identify which patients with osteoarthritis of the knee will derive benefit from a cruciate-sparing bi-UKA.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Banger, Mr Matthew and Jones, Mr Bryn and Blyth, Mr Mark and Doonan, Dr James
Authors: Blyth, M. J. G., Banger, M. S., Doonan, J., Jones, B. G., MacLean, A. D., and Rowe, P. J.
College/School:College of Medical Veterinary and Life Sciences > School of Infection & Immunity
College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing
Journal Name:Bone and Joint Journal
Publisher:British Editorial Society of Bone and Joint Surgery
ISSN:2049-4394
ISSN (Online):2049-4408
Published Online:01 October 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Bone and Joint Journal 103-B(10): 1561-1570
Publisher Policy:Reproduced under a Creative Commons License

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