title: Single-leg drop landing motor control strategies following acute ankle sprain injury.
abstract: No research currently exists investigating the effect of acute injury on single-limb landing strategies. The aim of the current study was to analyze the coordination strategies of participants in the acute phase of lateral ankle sprain (LAS) injury. Thirty-seven participants with acute, first-time LAS and 19 uninjured participants completed a single-leg drop landing task on both limbs. Three-dimensional kinematic (angular displacement) and sagittal plane kinetic (moment-of-force) data were acquired for the joints of the lower extremity from 200 ms pre-initial contact (IC) to 200 ms post-IC. The peak magnitude of the vertical component of the ground reaction force (GRF) was also computed. Injured participants displayed a bilateral increase in hip flexion, with altered transverse plane kinematic profiles at the knee and ankle for both limbs (P < 0.05). This coincided with a reduction in the net-supporting flexor moment of the lower extremity (P < 0.05) and magnitude of the peak vertical GRF for the injured limb (21.82 ± 2.44 N/kg vs 24.09 ± 2.77 N/kg; P = 0.013) in injured participants compared to control participants. These results demonstrate that compensatory movement strategies are utilized by participants with acute LAS to successfully reduce the impact forces of landing.
authors: School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland.
authors: C
authors: C
authors: Doherty
authors: Sport and Exercise Sciences Research Institute, Ulster Sports Academy, University of Ulster, Newtownabbey, Co. Antrim, Northern Ireland.
authors: C
authors: C
authors: Bleakley
authors: Department of Kinesiology, University of Virginia, Charlottesville, Virginia, USA.
authors: J
authors: J
authors: Hertel
authors: School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland.
authors: B
authors: B
authors: Caulfield
authors: St. Vincent's University Hospital, Dublin, Ireland.
authors: J
authors: J
authors: Ryan
authors: School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland.|Institute for Sport and Health, University College Dublin, Dublin, Ireland.
authors: E
authors: E
authors: Delahunt
mesh_terms: D000222:Adaptation, Physiological; D000293:Adolescent; D000328:Adult; D016512:Ankle Injuries / Q000503:physiopathology*; D000843:Ankle Joint / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D007700:Kinetics; D007719:Knee Joint / Q000502:physiology; D008297:Male; D009068:Movement; D013180:Sprains and Strains / Q000503:physiopathology*; D016474:Weight-Bearing; D055815:Young Adult
keywords: Ankle joint [MeSH]; biomechanics [MeSH]; kinematics [MeSH]; kinetics [MeSH]; task performance and analysis [MeSH]