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No statistically significant kinematic difference found between a cruciate-retaining and posterior-stabilised Triathlon knee arthroplasty: A laboratory study involving eight cadavers examining soft-tissue laxity

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


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The aim of this study was to compare the maximum laxity conferred by the cruciate-retaining (CR) and posterior-stabilised (PS) Triathlon single-radius total knee arthroplasty (TKA) for anterior drawer, varus-valgus opening and rotation in eight cadaver knees through a defined arc of flexion (0 degrees to 110 degrees). The null hypothesis was that the limits of laxity of CR- and PS-TKAs are not significantly different.The investigation was undertaken in eight loaded cadaver knees undergoing subjective stress testing using a measurement rig. Firstly the native knee was tested prior to preparation for CR-TKA and subsequently for PS-TKA implantation. Surgical navigation was used to track maximal displacements/rotations at 0 degrees, 30 degrees, 60 degrees, 90 degrees and 110 degrees of flexion. Mixed-effects modelling was used to define the behaviour of the TKAs.The laxity measured for the CR-and PS-TKAs revealed no statistically significant differences over the studied flexion arc for the two versions of TKA. Compared with the native knee both TKAs exhibited slightly increased anterior drawer and decreased varus-valgus and internal-external roational laxities. We believe further study is required to define the clinical states for which the additional constraint offered by a PS-TKA implant may be beneficial.

Publication metadata

Author(s): Hunt NC, Ghosh KM, Blain AP, Rushton SP, Longstaff LM, Deehan DJ

Publication type: Article

Publication status: Published

Journal: Bone & Joint Journal

Year: 2015

Volume: 97B

Issue: 5

Pages: 642-648

Print publication date: 01/05/2015

Acceptance date: 19/01/2015

ISSN (print): 2049-4394

ISSN (electronic): 2049-4408

Publisher: British Editorial Society of Bone and Joint Surgery


DOI: 10.1302/0301-620X.97B5.34999


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