| Purpose: this study mainly discusses the functional ankle instability and no ankle injury during walking speed and often encountered some slider sliding of gait stability study,to explore the functional ankle instability and without the differences between the gait stability of the ankle injury,to prevent the ankle injury again more abundant experimental and theoretical basis.Methods: In this study,16 subjects with functional ankle instability on the right side(FAI group)were recruited,and 15 healthy subjects without functional ankle instability(control group)were matched according to their height,age,weight and other characteristics.Using Qualisys 3 d motion capture system,Kistler force measurement platform,Delsys electrical system and plantar pressure system,in the process of acquisition in normal walking gait parameters of time and space,joint Angle,plantar pressure and ground reaction force,but also collected walk ramp suddenly move before and after,body side of lower limbs around the ankle,knee,hip joint Angle,and lower limb strands of rectus muscle and gastrocnemius muscle electrical parameters,using independent sample T test.Results:(1)The peak area of plantar pressure,load rate and other parameters of functional ankle instability patients during walking were different,and the experimental group was significantly higher than the control group(P <0.05).(2)The step speed,stride length,right single support time,left cycle and right cycle of functional ankle instability group were higher than those of control group(P <0.05).(3)The Angle of hip joint and ankle joint was different in patients with functional ankle instability when walking at normal walking speed(P <0.05).Before and after sliding,there were significant differences in the sagittal plane between the left and right hip,knee,and ankle joints and in the control group(P <0.05).There were significant differences in the Angle index of the affected foot,as well as in the coronal plane and horizontal plane(P<0.05).(4)The vertical ground reaction force,internal and external shear force,and anterior and posterior shear force of functional ankle instability group were lower than those of the control group at normal walking speed(P <0.05).(5)The ability of the affected foot to recruit motor units during muscle contraction will decrease in the patients with functional ankle instability,which will affect the healthy ankle.The percentage of muscle activity and peak value of RMS were lower than those of control group(P <0.05).Conclusion:(1)During normal walking,the plantar pressure of the functional ankle instability group was significantly higher than that of the control group,indicating that the ankle injury will increase the plantar pressure during normal walking,and may further aggravate the foot injury.(2)In normal walking,the ankle joint injury of functional ankle instability may cause the decrease of gait speed and step length.(3)Compared with healthy people,the left and right hip,knee and ankle joint angles of functional ankle instability patients were different before and after sliding.Ankle injury may cause changes in the Angle of the three joints of the lower limbs.(4)compared with healthy people,videotapes functional ankle instability is the vertical ground reaction force is lesser,can lead to push forward,will affect the ground force of the lower limbs on the ground,at the same time,before and after the direction of the shear force is small,leading to a lower forward direction friction and acceleration,may have a certain influence on walking speed.(5)In the patients with functional ankle instability,the control of muscles by the nervous system changed after the injury of the affected foot,and the activation intensity of related muscles decreased. |
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