Baker, RJ, Finney, L and Orr, J 1999, 'A new approach to determine the hip rotations profile from clinical gait analysis data' , Human Movement Science, 18 , pp. 655-667.
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Conventional models for determining joint rotation angles from marker positions as part of three-dimensional clinical gait analysis are susceptible to errors arising from mis-placement of the thigh markers. An analysis of idealised data reveals how the measured variables are affected by different angular offsets of the thigh marker from its true position. An artefact on the varus±valgus signal arising from the projection of true knee ¯exion onto a mal-aligned thigh segment axis is the most characteristic feature of this problem. If this is observed then the hip rotation pro®les are also erroneous. A technique is proposed to determine a correction factor which can be applied to gait data to correct for this mal-alignment. Its use is demonstrated on a single case study and a subjective assessment of its use on a cohort of 40 patients is reported. A detailed discussion of the assumptions on which the method is founded is included as well as guidelines as to when the technique is likely to be successful. It is recommended that the technique is used as an aid to training staff in marker placement rather than as a routine retrospective correction of data for erroneously placed markers.
|Themes:||Health and Wellbeing|
|Schools:||Schools > School of Health Sciences|
|Journal or Publication Title:||Human Movement Science|
|Depositing User:||RH Shuttleworth|
|Date Deposited:||07 Jul 2011 10:06|
|Last Modified:||30 Nov 2015 23:51|
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