Characterization Analysis of the Symmetry of Gait Parameters in Children with Mild Leg Length Discrepancy
Objective To analyze the symmetry characteristics of gait dynamics,kinematics,and spatial and temporal parameters in children with mild leg length discrepancy(LLD)and evaluate the likely influence or risk of LLD on children's growth to provide a theoretical basis for early assessment and intervention.Methods Using a modified conventional three-dimensional model,31 markers were placed on the body surface of each subject to collect the gait parameters and calculate the symmetry index(SI).The spatial distance of the ipsilateral markers between the anterior superior iliac spine-external knee-external ankle in the standing position was recorded as the leg length.Then,59 children with leg length difference in the range of 0.5 cm<l≤2.5 cm were included in the mild LLD group,and 42 children with leg length difference in the range of l<0.5 cm were included in the control group.According to the children's age,the mild LLD and control groups were divided further into 1-6 year old and 7-14 year old groups.Statistical analyses were conducted separately,and the SI difference in gait parameters was calculated between the groups.Results The SI of the vertical ground reaction force and maximum power of the knee joint were significantly different between children with mild LLD and healthy children aged 1-6 years.The SI of pelvic motion was significantly different between children with mild LLD and healthy children aged 7-14 years.Conclusions The younger age group showed an imbalance in muscle strength and control in children with LLD.Moreover,the imbalance during pelvic motion appeared as the gait pattern matured.This indicates that timely attention or early evaluation should be provided in the clinic.
leg length discrepancy(LLD)gait analysischildrensymmetry
NETL
NSTL
万方数据
