中文摘要：

分析脑瘫儿童下肢肌电信号复杂度特性和行走过程中踝关节跖屈角度和背伸角度大小特性,指导医生选择合适的治疗和康复措施。选择2014年6-7月间深圳市残疾人辅助器具资源中心的脑瘫儿童25例,患者下肢均异常,患者及家长自愿完成实验。25例脑瘫儿童年龄2-8岁,平均（5.44±1.85）岁,平均身高（108.44±13.39）cm,平均体质量（18.24±5.46）kg。受试者沿着5 m步态平台以自己最为舒适的步速行走,采用美国BIOPAC公司的MP150数据采集分析系统,获得下肢腓肠肌和胫骨前肌的表面肌电信号,采用加速度传感器记录踝关节角度参数,采用Footscan足底压力系统记录患儿足底压力参数,并在测试前由专业医师进行粗大运动功能测试。采用SPSS19.0软件对数据进行统计学分析。结果显示行走过程中脑瘫患儿下肢严重侧腓肠肌和胫骨前肌肌电信号平均样本熵分别为1.78和1.76,而较轻侧腓肠肌和胫骨前肌肌电信号平均样本熵分别为1.45和1.39,表明严重侧肌肉参加运动的运动单元数量比较轻侧有所增加。严重侧踝关节跖屈和背伸运动的角度峰值平均值分别为49.89°和-5.29°,而较轻侧踝关节跖屈和背伸运动的角度峰值平均值分别为54.28°和-8.20°,表明严重侧比较轻侧踝关节角度小。脑瘫患儿足底压力分布不均匀,足弓部位压力分布最大,并且足跟触地初期、足前部触地期、整足支撑期和足前部蹬离期时间依次呈增长趋势。

英文摘要：

The study aims to analyze the features of low limb based on electromyography complexity, the angle of ankle plantar flexion and dorsiflexion in children with cerebral palsy, and to provide guidance for doctors to select appropriate treatments and rehabilitation measures. Twenty-five children with cerebral palsy in Shenzhen Disabled Equipment Resource Center from Jun. 2014 to Jul. 2014 volunteered to participate in the experiment. All the patients with abnormal low limb aged2-8 years old, with an average age of（5.44±1.85） years, average height of（108.44±13.39） cm and average weight of（18.24±5.46） kg. During the subjects walks straight for 5 meters at their self-selected comfortable speed toward a target line on the floor, the MP150 analysis system of U.S. BIOPAC was used to acquire the information of ankle joints, including the surface electromyography signals of gastrocnemius and tibialis anterior of low limb; acceleration sensors was used to record the angle of ankle joints; Footscan plantar pressure system was used to record the plantar pressure parameters, and the gross motor function test was performed by professional doctors before the experiment. Statistical analysis was carried out using SPSS 19.0software. The experimental results showed that mean values of sample entropy from gastrocnemius and tibialis anterior muscle of the more-affected side were 1.78 and 1.76, respectively, and those of the less-affected side were 1.45 and 1.39, respectively,which showed that the number of gastrocnemius and tibialis anterior muscle motor unit of the more-affected side was much more than that of less-affected side in children with cerebral palsy during walking. The mean values of the angle peak of ankle plantar flexion and dorsiflexion of the more-affected side were 49.89° and-5.29°, respectively, and those of the less-affectedside were 54.28° and-8.20°, respectively, which showed that angle of the more-affected side was smaller than that of the lessaffected side. The distribution of planter pressure