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How Does Laxity After Single Radius Total Knee Arthroplasty Compare With the Native Knee?

Lookup NU author(s): Dr Nicola Hunt, Dr Alasdair Blain, Professor Stephen Rushton, Lee Longstaff, Professor David Deehan

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Abstract

Patients with total knee arthroplasties (TKAs) continue to report dissatisfaction in functional outcome. Stability is a major factor contributing to functionality of TKAs. Implants with single-radius (SR) femoral components are proposed to increase stability throughout the arc of flexion. Using computer navigation and loaded cadaveric legs, we characterized the "envelope of laxity" (EoL) offered by a SR cruciate retaining (CR)-TKA compared with that of the native knee through the arc of flexion in terms of anterior drawer, varus/valgus stress, and internal/external rotation. In both the native knee and the TKA laxity increased with increasing knee flexion. Laxities measured in the three planes of motion were generally comparable between the native knee and TKA from 0 degrees to 110 degrees of flexion. Our results indicate that the SR CR-TKA offers appropriate stability in the absence of soft tissue deficiency. (C) 2014 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.

Publication metadata

Author(s): Rushton SP; Deehan DJ; Blain AP; Hunt NC; Longstaff LM; Ghosh KM; Athwal KK; Amis AA

Publication type: Article

Publication status: Published

Journal: Journal of Orthopaedic Research

Year: 2014

Volume: 32

Issue: 9

Pages: 1208-1213

Print publication date: 01/09/2014

Online publication date: 20/05/2014

Acceptance date: 18/04/2014

ISSN (print): 0736-0266

ISSN (electronic): 1554-527X

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1002/jor.22645

DOI: 10.1002/jor.22645

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