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Title: In vivo knee joint mechanics : implications for musculotendon modelling
Author: Tsaopoulos, Dimitrios E.
ISNI:       0000 0001 3537 0800
Awarding Body: Manchester Metropolitan University
Current Institution: Manchester Metropolitan University
Date of Award: 2007
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The general aim of this thesis was to study knee joint mechanics in-vivo in healthy participants with particular attention to the quantification of the patellar tendon moment arm length and the accurate calculation of the actual knee joint moment when dynamometry-based musculotendon loading calculations are perfonned. Following a review of the relevant literature, the next chapter examined the pote!lttal relation between patellar tendon moment ann length and several relevant anthropometric characteristics. In the third chapter the variation in the patellar tendon moment ann length due to the use of different knee joint rotation centre origins was examined using in-vivo lateral X-ray imaging during passive knee extension. In the following study the knee joint moment errors induced during dynamometry testing due to the misalignment ofthe knee joint and dynamometer axes of rotation were examined accurately using X-ray imaging. The fifth chapter presents an experiment which 1) explores the changes in the patellar tendon moment ann length with different modes and intensities of muscle contraction using in vivo lateral X-ray imaging and 2) detennines the amount oferror in the estimation of the patellar tendon force when using resting-state moment arm values instead of the actual patellar tendon moment ann length values during muscle contraction. The results of the work in this thesis suggest that 1) the patellar tendon moment arm length variance cannot be explained by knee joint size differences and hence, existing imaging-based methodologies remain necessary for accurate quantification of the patellar tendon moment arm, 2) when patellar tendon moment ann length data are reported the clear definition of the used reference landmark is required and the limitations of each method should always be taken into account, 3) during dynamometry testing the moment recorded from the dynamometer in most instances overestimates the actual knee joint moment and therefore, these differences cannot be neglected if the musculotendon forces need to be detennined using dynamometry-based musculoskeletal loads calculations and 4) the patellar tendon moment ann length increased significantly with increased muscle contraction intensity.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available