title: Mediolateral foot placement ability during ambulation in individuals with chronic post-stroke hemiplegia.
abstract: Mediolateral (ML) foot placement is an effective way to redirect the lateral trajectory of the body center of mass (BCoM) during ambulation, but has only been partly characterized in the chronic post-stroke population despite their increased risk for falling [1]. During able-bodied gait, the locomotor system coordinates lower limb swing phase kinematics such that an appropriate ML foot placement occurs upon foot contact. Muscle weakness and abnormal motor patterns may impair foot placement ability post-stroke. The purpose of this study was to characterize ML foot placement ability during post-stroke ambulation by quantifying ML foot placement accuracy and precision, for the both sound and affected feet. Age matched able-bodied individuals were recruited for comparison. All participants were instructed to target step widths ranging from 0 to 45% leg length, as marked on the laboratory floor. Results of this study confirmed that ML foot placement accuracy and precision were significantly lower for the post-stroke group as compared to the control group (p=0.0). However, ML foot placement accuracy and precision were not significantly different between the affected and sound limbs in the post-stroke group. The lowest accuracy for post-stroke subjects was observed at both extreme step width targets (0 and 45%). Future work should explore potential mechanisms underlying these findings such as abnormal motor coordination, lower limb muscle strength, and abnormal swing phase movement patterns.
authors.affiliation: Northwestern University Prosthetics-Orthotics Center, Department of Physical Medicine & Rehabilitation, Feinberg School of Medicine, Chicago, IL, USA; Northwestern University, Department of Biomedical Engineering, Evanston, IL, USA. Electronic address: kikiz@u.northwestern.edu.
authors.forename: Angelika
authors.initials: A
authors.lastname: Zissimopoulos
authors.affiliation: Jesse Brown VA Medical Center, Department of Veterans Affairs, Chicago, IL, USA.
authors.forename: Rebecca
authors.initials: R
authors.lastname: Stine
authors.affiliation: Northwestern University Prosthetics-Orthotics Center, Department of Physical Medicine & Rehabilitation, Feinberg School of Medicine, Chicago, IL, USA.
authors.forename: Stefania
authors.initials: S
authors.lastname: Fatone
authors.affiliation: Northwestern University Prosthetics-Orthotics Center, Department of Physical Medicine & Rehabilitation, Feinberg School of Medicine, Chicago, IL, USA; Northwestern University, Department of Biomedical Engineering, Evanston, IL, USA; Jesse Brown VA Medical Center, Department of Veterans Affairs, Chicago, IL, USA.
authors.forename: Steven
authors.initials: S
authors.lastname: Gard
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D016022:Case-Control Studies; D005260:Female; D005528:Foot / Q000503:physiopathology*; D020233:Gait Disorders, Neurologic / Q000503:physiopathology*; D006429:Hemiplegia / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D004856:Postural Balance / Q000502:physiology*; D020521:Stroke / Q000503:physiopathology*; D016138:Walking / Q000502:physiology
keywords: Balance; Gait analysis; Human locomotion; Mediolateral foot placement; Stroke