Thesis

Validation of a novel 2D motion analysis system to the gold standard in 3D motion analysis for calculation of sagittal plane kinematics

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Awarding institution
  • University of Strathclyde
Date of award
  • 2013
Thesis identifier
  • T13660
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Abstract
  • Movement analysis is a key component of clinical diagnosis, treatment prescription and follow up of gait disorders. Instrumented 3D gait analysis is often financially and technically inaccessible in clinical environments. Other established methods of gait analysis include video and visual observation scores; however these techniques rely on subjective clinical expertise. The aim of this study is to compare a bespoke video based 2D motion analysis system (VOHM) to the 3D gold-standard. Ten participants (5 male, 5 female, mean age 23.3 ± SD2.8 years) with no history of gait disorders volunteered for this study. Participants were asked to walk at a self-selected speed until a minimum of 5 clean trials had been recorded. Digital video (Basler Ace series) and a 12 camera Vicon T-series 3D motion capture system were used to synchronously capture participants gait (100Hz). Parameters under investigation were shank to vertical angle, thigh to vertical angle, and knee joint centre flexion angle. Data processing was carried out using Nexus 1.8.2 for Vicon and VOHM for video data. Data analysis was performed using Matlab, SPSS and Microsoft Excel. Intra class correlation coefficients (ICC) showed strong significant agreement (p<0.001) between measurement systems for all parameters: ICC = 0.99(SHANK), 0.96(THIGH), 0.96(KJC). Spearman's rho correlations for SHANK, THIGH and KJC showed very strong (0.99, 0.93, 0.94 respectively) significant agreement (p<0.001). Linear regression analysis also showed significant (p<0.001) agreement with R2 values for SHANK, THIGH and KJC of 0.98, 0.95 and 0.97, respectively. Bland-Altman plots for each parameter indicated a high level of agreement. Statistical analyses revealed excellent agreement between Vicon and VOHM for analysing human gait. As a result, VOHM may be recommended for use in the clinic providing that only the parameters under investigation in this study are considered.
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DOI
Date Created
  • 2013
Former identifier
  • 1005036

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