title: Hip-ankle coordination during gait in individuals with chronic ankle instability.
abstract: Individuals with chronic ankle instability (CAI) may have sensorimotor impairments that affect control at the hip in addition to the ankle. The purpose of this study was to compare hip-ankle coordination and coordination variability between individuals with CAI and healthy individuals during walking. Ten healthy subjects and 10 subjects with CAI were recruited to walk on a treadmill. Hip-ankle coordination was quantified using vector coding, and coordination variability was quantified using coefficient of correspondence. We found significant between-group differences in hip-ankle coordination in the frontal plane around loading response (Control: 165.9±18.4°; CAI: 127.6±48.6°, p=0.04) and in the sagittal plane around the first half of mid stance (Control: 307.2±9.8°; CAI: 291.8±11.4°, p<0.01), terminal stance (Control: 301.1±13°; CAI: 313.4±10.9°, p=0.04), and pre-swing (Control: 243.9±35.2°; CAI: 329.9±57.8°, p<0.01). We also found significant between-group differences in hip-ankle coordination variability in the frontal plane around the second half of mid stance (Control: 0.54±0.06; CAI: 0.45±0.07, P<0.01). CAI is associated with alteration of hip-ankle coordination and coordination variability in stance phase during walking. Gait training is important in CAI rehabilitation, and the training should address altered hip-ankle coordination to reduce the risk of recurrent injuries.
authors.affiliation: Department of Physical Therapy, Movement and Rehabilitation Sciences, Bouvé College of Health Sciences, Northeastern University, 301 Robinson Hall, 360 Huntington Avenue, Boston, MA 02115, United States. Electronic address: s.yen@northeastern.edu.
authors.forename: Sheng-Che
authors.initials: SC
authors.lastname: Yen
authors.affiliation: School of Physical Therapy, College of Health Professions, Pacific University, United States.
authors.forename: Kevin K
authors.initials: KK
authors.lastname: Chui
authors.affiliation: Department of Physical Therapy, Movement and Rehabilitation Sciences, Bouvé College of Health Sciences, Northeastern University, 301 Robinson Hall, 360 Huntington Avenue, Boston, MA 02115, United States.
authors.forename: Marie B
authors.initials: MB
authors.lastname: Corkery
authors.affiliation: Department of Physical Therapy, Movement and Rehabilitation Sciences, Bouvé College of Health Sciences, Northeastern University, 301 Robinson Hall, 360 Huntington Avenue, Boston, MA 02115, United States.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Allen
authors.affiliation: Department of Physical Therapy, Movement and Rehabilitation Sciences, Bouvé College of Health Sciences, Northeastern University, 301 Robinson Hall, 360 Huntington Avenue, Boston, MA 02115, United States.
authors.forename: Caitlin M
authors.initials: CM
authors.lastname: Cloonan
mesh_terms: D000843:Ankle Joint / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D002908:Chronic Disease; D005080:Exercise Test; D005260:Female; D005684:Gait; D006621:Hip Joint / Q000503:physiopathology*; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D008297:Male; D016138:Walking; D055815:Young Adult
keywords: Ankle; Coordination; Coupling; Gait; Variability; Vector coding