title: Invited commentary.
authors.affiliation: Brain Rehabilitation Research Center, Malcom Randall VA Medical Center, Gainesville, Florida 32610-0154, USA.
authors.forename: Mark G
authors.initials: MG
authors.lastname: Bowden
authors.forename: Andrea L
authors.initials: AL
authors.lastname: Behrman
mesh_terms: D004185:Disability Evaluation; D005684:Gait / Q000502:physiology*; D020233:Gait Disorders, Neurologic / Q000209:etiology / Q000503:physiopathology*; D006621:Hip Joint / Q000503:physiopathology; D006801:Humans; D035002:Lower Extremity / Q000503:physiopathology; D004856:Postural Balance; D016059:Range of Motion, Articular; D013119:Spinal Cord Injuries / Q000150:complications / Q000503:physiopathology*; D016138:Walking / Q000502:physiology*