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Sagittal flexion arc evaluation for a modern generation single-radius femoral component design

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.

Publication metadata

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


DOI: 10.1177/0954411918759136


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