Background

Gait asymmetry is an important characteristic often studied in stroke patients. Several methods have been used to define gait asymmetry using joint angles. However, these methods may require normative data from healthy individuals as reference points. This study used normalized cross-correlation (CC_norm) to define kinematic gait asymmetry in individuals after stroke and investigated the usefulness of this assessment.

Research question

Is the analysis of kinematic gait asymmetry based on joint angle data using CC_norm useful for gait assessment in patients with chronic stroke?

Methods

The study involved 12 patients with chronic stroke. A motion analysis system was used to record gait speed, hip joint angles, knee joint angles, ankle joint angles, stance time, and swing time. The CC_norm was calculated using the flexion-extension joint angles of hip, knee, and ankle in the sagittal plane to assess the degree of kinematic gait asymmetry. The symmetry ratio (SR) was calculated using stance and swing times to assess the degree of temporal gait asymmetry. Clinical outcomes were measured using the Fugl-Meyer Assessment for the lower extremity (FMA-LE), Berg Balance Scale (BBS), and Functional Independence Measure (FIM).

Results

Hip CC_norm was correlated with SR_swing (r=-0.612, p < 0.05). Knee CC_norm was correlated with SR_stance (r = 0.807, p < 0.01), SR_swing (r=-0.752, p < 0.05), gait speed (r = 0.654, p < 0.05), BBS (r = 0.717, p < 0.01), and FIM (r = 0.735, p < 0.01).

Significance

Hip and knee joint CC_norm appear to be useful tools for the assessment of gait asymmetry in stroke patients. In addition, kinematic gait asymmetry of the knee joint could reflect physical function, balance, and activities of daily living. These findings underline the importance of using kinematic gait asymmetry assessment in chronic stroke patients.

中文翻译：

---

慢性卒中患者使用关节角度数据进行运动步态不对称评估-归一化互相关方法。

背景

步态不对称是中风患者经常研究的重要特征。已经使用几种方法使用关节角度定义步态不对称性。但是，这些方法可能需要健康个体的标准数据作为参考点。这项研究使用归一化互相关（CC _norm）定义中风后个体的运动步态不对称性，并研究了该评估的有效性。

研究问题

使用CC_规范基于关节角度数据进行运动步态不对称性分析是否对慢性卒中患者的步态评估有用？

方法

该研究涉及12例慢性中风患者。运动分析系统用于记录步态速度，髋关节角度，膝关节角度，踝关节角度，站立时间和摆动时间。CC_范数是使用髋，膝和踝在矢状面内的屈伸关节角度来计算的，以评估运动步态的不对称程度。使用姿势和摆动时间计算对称率（SR），以评估时间步态的不对称程度。使用下肢的Fugl-Meyer评估（FMA-LE），伯格平衡量表（BBS）和功能独立性测量（FIM）来测量临床结局。

结果

髋关节CC_规范与SR_摆动相关（r = -0.612，p <0.05）。膝盖CC_规范与SR_姿势（r = 0.807，p <0.01），SR_挥杆（r = -0.752，p <0.05），步态速度（r = 0.654，p <0.05），BBS（r = 0.717，p）相关<0.01）和FIM（r = 0.735，p <0.01）。

意义

髋关节和膝关节CC_规范似乎是评估中风患者步态不对称性的有用工具。此外，膝关节的运动步态不对称可能反映身体的功能，平衡和日常生活活动。这些发现强调了在慢性中风患者中使用运动步态不对称评估的重要性。