Graduate Thesis Or Dissertation
 

Radiographic validation and reliability of selected measures of pronation and biomechanical analysis of tarsal navicular displacement under static and dynamic loading conditions

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  • The navicular drop test (NDT), Feiss' line (FL) and standing foot angle (SFA) are clinical tests used to estimate the amount of pronation via inferior displacement of the tarsal navicular. Thirty-two patients (female and male, ages 18-65) who sought medical treatment for lower extremity pathologies participated in the study that assessed the reliability and validity of the NDT and the FL. The NDT and FL tests had moderate to good (r = 0.608 0.885) positive correlation values, with the exception of the FL change in position value (r = -.09 1). The intra-examiner reliability results showed good to excellent consistency for all measures of the NDT and FL tests (ICC = 0.8 17 0.939). The inter-examiner reliability measures were poor to moderate for the FL test of pronation (ICC = 0.425 0.742), while the reliability for the NIDT was moderate to good (ICC = 0.686 - 0.886). These findings suggest that the validity of the NDT was moderate, and that the FL test was questionable. The intra-examiner reliability was strong for both the NDT and FL tests. Forty-six (23 women, 23 men) subjects participated in the study that evaluated the relationship between two static clinical tests (NDT and SFA) of pronation and three-dimensional movement of the bones of the foot. Poor to moderate positive relationships were observed (p < .05) between the NDT and the dynamic navicular movement during the walking and running conditions (Spearman's rho 0.340 and 0.397, respectively). We observed that each of the regression models used to explain dynamic navicular movement during walking, running, and drop landing were statistically significant (p <0.05). The explained variance of the dynamic navicular drop for the running condition was the largest (R² = .531), while the model for walking showed the least explained variance (R² = .289). The explained variance for dynamic SFA was the greatest for the walking condition (R² .373), while the model for drop landing had the least explained variance (R² = .330). This research supports the continued use of the NDT as an indicator of dynamic navicular displacement, but questions the use of the SFA measurement.
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