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. 2020 May 16;9(1):15-22.
doi: 10.1302/2046-3758.91.BJR-2019-0147.R1. eCollection 2020 Jan.

Robotic-assisted unicompartmental knee arthroplasty has a greater early functional outcome when compared to manual total knee arthroplasty for isolated medial compartment arthritis

N D Clement  1 , A Bell  2 , P Simpson  3 , G Macpherson  3 , J T Patton  3 , D F Hamilton  4
Affiliations

Robotic-assisted unicompartmental knee arthroplasty has a greater early functional outcome when compared to manual total knee arthroplasty for isolated medial compartment arthritis

N D Clement et al. Bone Joint Res. .

Abstract

Aims: The primary aim of the study was to compare the knee-specific functional outcome of robotic unicompartmental knee arthroplasty (rUKA) with manual total knee arthroplasty (mTKA) for the management of isolated medial compartment osteoarthritis. Secondary aims were to compare length of hospital stay, general health improvement, and satisfaction between rUKA and mTKA.

Methods: A powered (1:3 ratio) cohort study was performed. A total of 30 patients undergoing rUKA were propensity score matched to 90 patients undergoing mTKA for isolated medial compartment arthritis. Patients were matched for age, sex, body mass index (BMI), and preoperative function. The Oxford Knee Score (OKS) and EuroQol five-dimension questionnaire (EQ-5D) were collected preoperatively and six months postoperatively. The Forgotten Joint Score (FJS) and patient satisfaction were collected six months postoperatively. Length of hospital stay was also recorded.

Results: There were no significant differences in the preoperative demographics (p ⩾ 0.150) or function (p ⩾ 0.230) between the groups. The six-month OKS was significantly greater in the rUKA group when compared with the mTKA group (difference 7.7, p < 0.001). There was also a greater six-month postoperative EQ-5D (difference 0.148, p = 0.002) and FJS (difference 24.2, p < 0.001) for the rUKA when compared to the mTKA. No patient was dissatisfied in the rUKA group and five (6%) were dissatisfied in the mTKA, but this was not significant (p = 0.210). Length of stay was significantly (p < 0.001) shorter in the rUKA group (median two days, interquartile range (IQR) 1 to 3) compared to the mTKA (median four days, IQR 3 to 5).

Conclusion: Patients with isolated medial compartment arthritis had a greater knee-specific functional outcome and generic health with a shorter length of hospital stay after rUKA when compared to mTKA.Cite this article: Bone Joint Res 2019;9(1):15-22.

Keywords: Arthroplasty; Knee; Medial; Partial; Robotic; Total.

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Conflict of interest statement

Conflict of interest statement: D. F. Hamilton, A. Bell, P. Simpson, G. Macpherson, and J. T. Patton report institutional grants (paid to The Royal Infirmary of Edinburgh) from Stryker, related to this study. D. F. Hamilton, P. Simpson, G. Macpherson, and J. T. Patton also report personal payment for lectures and institutional grants (paid to The Royal Infirmary of Edinburgh) from Stryker, not related to this study. P. Simpson, G. Macpherson, and J. T. Patton report personal consultancy fees and payments for development of educational presentations from Stryker, not related to this study.

Figures

Fig. 1
Fig. 1
Six-month postoperative patient-reported outcome measures (PROMs) for the robotic unicompartmental knee arthroplasty (rUKA, grey bars) and manual total knee arthroplasty (mTKA, white bars) groups. Error bars represent 95% confidence intervals. EQ-5D, EuroQol five-dimension questionnaire; FJS, Forgotten Joint Score; OKS, Oxford Knee Score; VAS, visual analogue scale.
See this image and copyright information in PMC

References

    1. Price AJ, Webb J, Topf H, Dodd CA, Goodfellow JW, Murray DW; Oxford Hip and Knee Group. Rapid recovery after oxford unicompartmental arthroplasty through a short incision. J Arthroplasty. 2001;16(8):970-976. - PubMed
    1. Patil S, Colwell CW, Jr, Ezzet KA, D’Lima DD. Can normal knee kinematics be restored with unicompartmental knee replacement? J Bone Joint Surg Am. 2005;87(2):332-338. - PubMed
    1. Liddle AD, Judge A, Pandit H, Murray DW. Adverse outcomes after total and unicompartmental knee replacement in 101,330 matched patients: a study of data from the National Joint Registry for England and Wales. Lancet. 2014;384(9952):1437-1445. - PubMed
    1. Murray DW, Parkinson RW. Usage of unicompartmental knee arthroplasty. Bone Joint J. 2018;100-B(4):432-435. - PubMed
    1. No authors listed. National Joint Registry 14th Annual Report 2017. National Joint Registry for England, Wales, Northern Ireland and the Isle of Man. https://reports.njrcentre.org.uk/Portals/0/PDFdownloads/NJR%2014th%20Ann....