英文摘要 |
Introduction: Ankle sprain was one of the most common sports injuries, which is often occurs at the repeated jumps and lateral movement of the landing phase. Recurrent ankle sprain may develop into chronic ankle instability (chronic ankle instability, CAI). Most previous studies of ankle instability investigated differences between CAI and healthy subjects, but few studies have emphazied on those who had sprined ankles but without mechanical or pathalogical symptoms (ankle sprain coper, Coper). The objective of this study was to evaluate the continues side hopping and landing patterns in CAI athletes, Coper athletes, and healthy athletes. We focus on using functional movements to analyze the motion differences between these three groups. Methods: There were 30 collegiate Division I athletes (10 healthy control, 10 Copers, and 10 CAI who were sex, age, height, and weight matched with healthy control) volunteered in this study. All groups need to fill the Cumberland Ankle Instability Tool (CAIT) for grouping. All participants performed a side-to-side hopping task that consisted of hopping single-legged 4 times consecutively from side to side across 2 lines marked apart on 2 individual force plates. The hoping distance was normalized by 210% of individual's ASIS distance. Kinematics and kinetics data were collected by 10 Vicon infrared cameras at 200 Hz and two Kistler force platforms at 1000 Hz. Two-way mixed analysis of variance (ANOVA) was used to compare the difference of biomechanics parameters between the direction of landing and groups. The level of statistical significance was set at α < .05. Results: There was no significant difference in joint kinematics among groups during both medial and lateral side hopping. The healthy group showed significantly greater ROM of ankle joint compared to the CAI group. When landing on medial side, joint angles of ankle plantar flexion, knee flexion and hip flexion were significantly greater than landing on lateral side. In addition, joint kinematics of frontal plane were significantly affected by landing directions. Conclusions: In this study, we found CAI group was limited with ankle dorsiflexion angle, which reduces shock attenuation of ankle joint, and thus has a large vertical ground reation force. The ankle joint status of Coper was between healthy and CAI groups. However, landing directions could influence kinematics patterns in frontal plane entirely. Landing from lateral hopping, maintained posture stability by hip abduction and adduction angles, though landing from medial hopping utilized ankle inversion and eversion angles. That might be the reason of re-injury in CAI and Copers. |