Patellofemoral Joint Forces and Stress During Forward Step-up, Lateral Step-up, and Forward Step-down Exercises
Patellofemoral Joint Forces and Stress During Forward Step-up, Lateral Step-up, and Forward Step-down Exercises
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DOI：
10.2519/jospt.2011.3408
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发表时间：
2011-04-01
影响因子：
6.1
通讯作者：
Powers, Christopher M.
中科院分区：
文献类型：
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作者：
Chinkulprasert, Chatchada;Vachalathiti, Roongtiwa;Powers, Christopher M.
研究设计：采用重复测量设计的对照实验室研究。目的：量化向前踏步(FSU)、侧向踏步(LSU)时的髌股关节反作用力(PFJRF)和应力(PFJS)。背景：虽然FSU、LSU和FSD运动是膝关节康复中常用的运动方式，但这些踏步作业对髌股关节动力学的影响尚未量化。方法：对20名健康成人进行FSU、LSU和FSD运动过程中的三维下肢运动学、动力学和肌电(EMG)数据。每个参与者的台阶高度都进行了调整，以允许标准的膝关节屈曲角度为45度。在每项任务中，使用先前描述的髌股关节的生物力学模型来量化PFJRF和PFJS。采用双因素方差分析(ANOVA)，比较各步骤任务同心和偏心时的峰值PFJRF和PFJS。结果：当跨同心和偏心时相崩溃时，FSD时的峰值PFJS(平均值+/-SD，13.8+/-0.4 Mpa)显著大于LSU时(11.5+/-0.8 Mpa：P
STUDY DESIGN: Controlled laboratory study using a repeated-measures design.OBJECTIVE: To quantify patellofemoral joint reaction force (PFJRF) and stress (PFJS) during forward step-up (FSU), lateral step-up (LSU). and forward step-down (FSD) exercises.BACKGROUND: Although FSU, LSU, and FSD exercises are commonly used in patellofemoral joint rehabilitation programs, the influence of these stepping tasks on patellofemoral joint kinetics has not been quantified.METHODS: Three-dimensional lower extremity kinematics and kinetics and electromyographic (EMG) data were obtained from 20 healthy adults during their performance of FSU, LSU, and FSD exercises. The step height for each participant was adjusted to permit a standardized knee flexion angle of 45 degrees. A previously described biomechanical model of the patellofemoral joint was used to quantify PFJRF and PFJS during each task. Peak PFJRF and PFJS during the concentric and eccentric phases of each step task were compared using a 2-factor analysis of variance (ANOVA).RESULTS: When collapsed across concentric and eccentric phases, peak PFJS was significantly greater during the FSD (mean +/- SD, 13.8 +/- 0.4 MPa) compared to the LSU (11.5 +/- 0.8 MPa: P