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Lookup NU author(s): Professor David Deehan, Dr Alasdair Blain, Lee Longstaff, Professor Stephen Rushton
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© 2018, IMechE 2018. Single-radius femoral total knee design aims to deliver improved kinematic behaviour when compared to the standard two-radii geometry. This study has evaluated the behaviour, through a functional range of motion in the sagittal plane, of a single-radius femoral component compared to a dual-radius standard knee construct. Particular focus was placed on how the flexion axes of the native and replaced knee approximated to the transepicondylar axis through a loaded navigated knee design. Significant differences in flexion arcs were noted between the native and total knee arthroplasty state. These arcs were not uniform in all knees and did not display single-radius behaviour. There were no significant differences in the location of flexion axes in the native and total knee arthroplasty knee. Both exhibited similar posterior and inferior transverse axes of motion with respect to the anatomical epicondylar axis. This work has cast doubt on the reliability under loaded conditions of the single-radius concept, but the close proximity of the flexion axes of each replaced knee in relation to the functional flexion axis of the native knee may be the true basis of this purported improved kinematic performance.
Author(s): Deehan DJ, Ghosh KM, Blain A, Longstaff L, Rushton S
Publication type: Article
Publication status: Published
Journal: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Year: 2018
Volume: 232
Issue: 4
Pages: 412-417
Print publication date: 01/04/2018
Online publication date: 23/02/2018
Acceptance date: 22/01/2018
ISSN (print): 0954-4119
ISSN (electronic): 2041-3033
Publisher: SAGE Publications Ltd
URL: https://doi.org/10.1177/0954411918759136
DOI: 10.1177/0954411918759136
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