Analysis Of Lower Limb Muscle Strength And Functional Characteristics In Chronic Ankle Instability Population Based On Hiller Model

Objective: Compare and Analyze if there have specific difference between different subgroups based on Hiller chronic ankle instability model,among the subgroup and the control group in lower limb muscle strength,dynamic and static posture stability and lower limb function ability.Discussing whether can according to the grouping of Hiller’s model to guide targeted rehabilitation.Methods: the study have tested for 149 chronic ankle instability patients and 24 control subjects with the measurement of the morphology,the single leg balance test with eyes closed for 30 seconds,star excursion balance test,hip isometric strength test,ankle isokinetic muscle strength test,6-meter crossover hop test and side hop test.Univariate analysis of variance or nonparametric test was used to compare the test results between each subgroup and between each subgroup and the control group.Results: in the single leg balance test with eyes closed for 30 seconds,the subgroup which perceiving instability in the male patients showed less static posture stability compared with the subgroup without perceiving instability,and the subgroup which perceiving instability showed less static posture stability compared with the control group.There was no difference between subgroups or between each subgroup and control group in female patients;In the star excursion balance test,male and female patients in each subgroup showed worse dynamic posture stability compared with the control group,while there was no difference between different subgroups;In the isometric strength test of hip joint,each subgroup of male and female patients showed worse hip abduction and hip extension strength compared with the control group,while there was no difference between different subgroups.In the isokinetic strength test of ankle,each subgroup of male and female patients showed less eversion muscle concentric and eccentric strength compared with the control group,the mechanical instability + perceived instability + recurrent sprain group showed less eversion muscle concentric strength under different angular velocity compared with other subgroups,Compared with the subgroup without recurrent sprain,the subgroup with recurrent sprain showed weaker eccentric strength of eversion muscle at different angular velocities.There was no difference in ankle dorsiflexion muscle strength between each subgroup and control group and between subgroups in male and female patients;In 6-meter crossover hop test,No differences were found between each subgroup and the control group or between different subgroups of patients with chronic ankle instability.In the side hop test,The subgroup with perceiving instability in male patients showed lower functional ability than the control group and the recurrent sprain group.each subgroup in the female patients also showed lower functional ability in compared with the control group.Conclusion: Based on classification of Hiller’s model in patients with chronic ankle instability,there are some certain differences of deficiency only in terms of eversion muscle strength and lower limb function.Compared with the control group,all the subgroups showed weaker ankle eversion muscle strength.The eccentric strength of the ankle eversion muscle were more weaker in the subgroups with recurrent sprain,The concentric strength of ankle eversion in the mechanical instability + perceived instability + recurrent sprain group was more weaker.The subgroups with perceiving instability showed worse lower limb function ability than the control group.