Hindfoot and forefoot kinematic differences among individuals with and without Functional Ankle Instability

摘要: HINDFOOT AND FOREFOOT KINEMATIC DIFFERENCES AMONG INDIVIDUALS WITH WITHOUT FUNCTIONAL ANKLE INSTABILITY By Cynthia J. Wright, M.Ed. A dissertation submitted in partial fulfillment of the requirements for degree Doctor Philosophy at Virginia Commonwealth University. University, 2011. Major Director: Dr. Brent L. Arnold, Associate Professor, Department Health and Human Performance Introduction: Following lateral ankle sprain, many individuals experience recurrent injury symptoms giving-way, known as Functional Ankle Instability (FAI). It has been proposed that altered joint kinematics during activity may contribute to instability these individuals, however research findings have inconsistent. Objective: To capture foot kinematic data two common tasks (walking gait jump landing) among three groups: with FAI, healthy controls copers. Design: 3-group observational cross-sectional study. Participants: Participants included 23 a history ≥ 1 sprain least 2 episodes giving-way past year (FAI: M±SD; age=23.30±3.84years; height=1.71±0.11m, weight=68.66±14.60kg; Cumberland Tool [CAIT]=20.52±2.94, giving-way=5.81±8.42 per month), subjects no or their lifetime (Controls: age=23.17±4.01years, height=1.72±0.08m, weight=68.78± 13.26kg, CAIT: 28.78±1.78), single subsequent (Copers: age=23.52±3.68years, height=1.72±0.07m, weight=69.57±13.94kg; 27.74 ± 1.69). Interventions: Ten trials natural walking 10 leg drop jumps were recorded using ViconMX motion monitoring system (OMG, Oxford, UK) imbedded force plates (Bertec, Columbus, Ohio, USA). Main Outcome Measures: Forefoot hindfoot sagittal frontal plane angles calculated initial contact (IC) toe-off (TO) gait, IC maximal vertical ground reaction landing. Results: At IC, there was significant group difference forefoot inversion (F2,66=4.68, p=0.013). Post hoc testing revealed FAI significantly more inverted than controls, but copers not different from control groups. landing differences (F2,66=6.12, p=0.004). Specifically, dorsiflexed coper There other (all p>0.05). Conclusions: Kinematic exist between FAI. Copers both experienced injury, yet do instability. Analysis movement patterns compared groups provide insight into coping mechanisms.