Analysis Of Pelvic Movement Characteristics And Compensatory Mechanism Of Swing Phase In Stroke Patients With Foot Drop

Objective: To study the characteristics of pelvic movement in swing phase of stroke patients with foot drop and to explore the mechanism of pelvic compensation.Methods: 30 stroke patients with foot drop were selected as the experimental group and30 healthy subjects as the control group.According to the principle of the same sex and the same age as the hemiplegic side and non-hemiplegic side of the experimental group,the data of the left and right sides of the control group were divided into control group 1and control group 2.The three-dimensional gait analysis system was used to collect and analyze the spatio-temporal parameters of the experimental group and the control group and the kinematic parameters of the pelvis and ankle joint in the swing phase,and the correlation between the angle of the pelvis and ankle joint was analyzed.Results: Compared with the non-hemiplegic side,the walking frequency and the percentage of support phase in the hemiplegic side decreased,the maximum posterior inclination and pronation angle of the pelvis decreased,the maximum supination and upward inclination angle increased,the sagittal plane,coronal plane and cross section ROM increased,the maximum ankle dorsiflexion decreased and the maximum ankle metatarsal flexion increased.Compared with control group 1,the step length of hemiplegic side shortened,the step speed slowed down,the step frequency decreased,the percentage of supporting phase prolonged,the maximum anteversion,supination,upward tilt angle,sagittal plane and cross section ROM of pelvis increased,while the maximum pronation and downward inclination angle decreased,the maximum dorsiflexion angle and ROM of ankle joint decreased（all P < 0.05）.Compared with control group 2,the non-hemiplegic side showed shorter step length,slower walking speed,lower walking frequency,longer percentage of support period,increased maximum anteversion and posterior inclination of pelvis,decreased ROM on cross section and coronal plane,and decreased maximum metatarsal flexion angle and ROM of ankle joint（all P< 0.05）.There was a significant negative correlation between pelvic rotation and maximum ankle dorsiflexion and ankle metatarsal flexion（all P < 0.05）,and there was a significant negative correlation between pelvic inclination and maximum ankle metatarsal flexion（all P< 0.05）.Conclusion: The pelvic motion characteristics in the swing phase of stroke patients with foot drop are significant.There is a certain correlation between the pelvis and ankle joint movements.The compensatory strategy of the pelvis will change with different degrees of foot drop.At this time,the compensatory motion of other joints may play an important role.