Biomechanic changes in passive properties of hemiplegic ankles with spastic hypertonia
Biomechanic changes in passive properties of hemiplegic ankles with spastic hypertonia
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DOI：
10.1016/j.apmr.2003.11.041
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发表时间：
2004-10-01
影响因子：
4.3
通讯作者：
Zhang, LQ
中科院分区：
文献类型：
--
作者：
Chung, SG;van Rey, E;Zhang, LQ
目的：定量研究偏瘫痉挛踝关节被动特性的生物力学变化。设计：在控制关节扭矩和关节位置的情况下，通过在背屈和趾屈极端位置之间缓慢移动踝关节来评估痉挛高张力。地点：机构研究中心。参与者：24例中风痉挛踝关节患者和32名健康对照。主要观察指标：受控背屈和趾屈位置的被动阻力力矩，受控扭矩下的背屈和趾屈活动范围，以及背屈和趾屈的准静态僵硬和能量损失。结果：痉挛高张踝关节在足屈(P=.041)和背屈(P=.016)方向上的被动特性发生了显著变化。与健康对照组相比，痉挛踝关节在背屈10度时表现出更高的阻力扭矩(9.51+/-4.79 Nm比6.21+/-3.64 Nm，P=0.016)，更高的准静态刚度(0.54+/-0.19 Nm/deg比.35+/-20 Nm/deg，P=.001)，更大的归一化背屈能量损失(0.068+/-0.04J/deg比.04+/-0.02J/deg，P=.037)，以及在阻力扭矩10 Nm时背屈肌力下降(10.77+/-8.69度比20.02+/-11.67度，P=.014)。痉挛高张踝关节屈屈时的阻力力矩、活动度和僵硬程度也有相似的变化(P
Objective: To investigate quantitatively biomechanic changes in the passive properties of hemiplegic spastic ankles.Design: Evaluation of spastic hypertonia by moving the ankle joint slowly between dorsiflexion and plantarflexion extreme positions under controlled joint torque and position.Setting: Institutional research center.Participants: Twenty-four stroke patients with spastic ankles and 32 healthy controls. Interventions: Not applicable.Main Outcome Measures: Passive resistance torque at controlled dorsiflexion and plantarflexion positions, dorsiflexion and plantarflexion range of motion (ROM) at controlled torques, and quasistatic stiffness and energy loss in dorsiflexion and plantarflexion.Results: Spastic hypertonic ankles showed significant alterations of the passive properties in plantarflexion (P=.041) as well as in dorsiflexion (P=.016) directions. Compared with healthy controls, spastic ankles showed higher resistance torque (9.51+/-4.79Nm vs 6.21+/-3.64Nm, P=.016), higher quasistatic stiffness (.54+/-.19Nm/deg vs .35+/-.20Nm/deg, P=.001) at 10degrees of dorsiflexion, larger normalized dorsiflexion energy loss (.068+/-.04J/deg vs .04+/-.02J/deg, P=.037), and decreased dorsiflexion ROM at 10Nm of resistance torque (10.77degrees+/-8.69degrees vs 20.02degrees+/-11.67degrees, P=.014). The resistance torque, ROM, and stiffness of spastic hypertonic ankles in plantarflexion showed similar changes (P