Papers by Elizabeth Hassan
Background: Lateral wedges have been suggested for the treatment of individuals with knee osteoar... more Background: Lateral wedges have been suggested for the treatment of individuals with knee osteoarthritis, but it may have undesirable effects on the biomechanics of gait through increased foot pronation. This study investigated the effects of increased unilateral foot pronation on the biomechanics of individuals with knee osteoarthritis during gait. Methods: Biomechanical data of twenty individuals with knee osteoarthritis were collected while they walked in three conditions: i) flat sandals; ii) wedged sandal on the knee osteoarthritis limb and flat sandal on the healthy limb; and iii) flat sandal on the osteoarthritis and wedged sandal on the healthy limb. Knee pain and comfort were evaluated. Principal Component Analysis followed by ANOVA was implemented to identify differences between conditions. Findings: The wedged sandal on the osteoarthritis limb increased rearfoot eversion (P b 0.001; ES = 0.79); increased shank rotation range of motion (P b 0.001; ES = 0.70); reduced knee internal rotation moment (P b 0.001; ES = 0.83); reduced hip internal rotation moment (P = 0.001; ES = 0.66); increased ipsilateral trunk lean (P = 0.031; ES = 0.47); and increased trunk rotation range of motion (P = 0.001; ES = 0.69). Walking with the wedged sandal on the healthy limb increased hip (P = 0.003; ES = 0.61) and knee (P = 0.002; ES = 0.63) adduction moments. Individuals reported greater comfort walking with the flat sandals (P = 0.004; ES = 0.55).
The purpose of this study was to quantify the dynamic accuracy of kinematics measured by a digita... more The purpose of this study was to quantify the dynamic accuracy of kinematics measured by a digital optical motion analysis system in a gait analysis laboratory (capture volume approximately 20 m 3 ) compared to a standard range direct-current electromagnetic (EM) tracking device (capture volume approximately 1 m 3 ). This is a subset of a larger effort to establish an appropriate marker set for the optical system to quantify upperlimb kinematics simultaneously with gait, in comparison to previous studies of isolated upperlimb movements that have employed EM tracking devices. Rigid clusters of spherical reflective markers and EM sensors were attached to a mechanical articulator that mimicked three-dimensional joint rotations, similar to the elbow. As the articulator was moved through known ranges of motion (i.e. gold standard), kinematic data were collected simultaneously using both tracking systems. Both systems were tended to underestimate the range of motion; however, the application of post hoc smoothing and least-squares correction algorithms reduced these effects. When smoothing and correction algorithms were used, the magnitude of the mean difference between the gold standard and either the EM or optical system did not exceed 21 for any of the compound motions performed. This level of agreement suggests that the measurements obtained from either system are clinically comparable, provided appropriate smoothing and correction algorithms are employed. r
Conference Presentations by Elizabeth Hassan
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Papers by Elizabeth Hassan
Conference Presentations by Elizabeth Hassan