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The relationship of the angle of immobilisation of the knee to the force applied to the extensor mechanism when partially weight-bearing. A gait-analysis study in normal volunteers.

Khan, WS; Jones, RK; Nokes, L; Johnson, DS; (2007) The relationship of the angle of immobilisation of the knee to the force applied to the extensor mechanism when partially weight-bearing. A gait-analysis study in normal volunteers. J Bone Joint Surg Br , 89 (7) 911 - 914. 10.1302/0301-620X.89B7.18452.

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Abstract

We describe the influence of the angle of immobilisation during partial weight-bearing on the forces across the extensor mechanism of the knee. Gait analysis was performed on eight healthy male subjects with the right knee in an orthotic brace locked at 0 degree, 10 degrees, 20 degrees and 30 degrees, with the brace unlocked and also without a brace. The ground reaction force, the angle of the knee and the net external flexion movement about the knee were measured and the extensor mechanism force was calculated. The results showed a direct non-linear relationship between the angle of knee flexion and the extensor mechanism force. When a brace was applied, the lowest forces occurred when the brace was locked at 0 degree. At 30 degrees the forces approached the failure strength of some fixation devices. We recommend that for potentially unstable injuries of the extensor mechanism, when mobilising with partial weight-bearing, the knee should be flexed at no more than 10 degrees.

Type: Article
Title: The relationship of the angle of immobilisation of the knee to the force applied to the extensor mechanism when partially weight-bearing. A gait-analysis study in normal volunteers.
Location: England
DOI: 10.1302/0301-620X.89B7.18452
Language: English
Keywords: Adult, Biomechanical Phenomena, Gait, Humans, Immobilization, Knee Joint, Male, Musculoskeletal System, Weight-Bearing
UCL classification: UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Surgery and Interventional Science (Division of)
URI: http://discovery.ucl.ac.uk/id/eprint/1353418
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