title: Dual-function foot orthosis: effect on shock and control of rearfoot motion.
abstract: Orthoses have been designed that claim to both reduce shock and control rearfoot motion. It was hypothesized that the dual-purpose soft orthosis would reduce shock and control rearfoot motion greater than a no-orthotic condition. Three-dimensional kinematic and kinetic data were collected along with tibial acceleration while subjects ran in no-orthotic, the dual-purpose orthotic, and a rigid orthotic condition. Variables of interest were eversion excursion, peak eversion, eversion velocity, peak positive acceleration, loading rate, and leg stiffness. None of the evaluated variables were significantly different (p = .05) between the three conditions. These data suggest that shock attenuation and rearfoot motion cannot be controlled by the orthoses used in this study for a group of healthy runners.
authors.affiliation: Department of Physical Therapy, University of Delaware, Newark, DE 19716-2591, USA. rbutler@udel.edu
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Butler
authors.forename: Irene McClay
authors.initials: IM
authors.lastname: Davis
authors.forename: Carrie M
authors.initials: CM
authors.lastname: Laughton
authors.forename: Malcolm
authors.initials: M
authors.lastname: Hughes
mesh_terms: D000293:Adolescent; D000328:Adult; D006365:Heel / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D009038:Motion; D009068:Movement; D009989:Orthotic Devices; D012420:Running / Q000502:physiology; D013977:Tibia / Q000502:physiology