Musculoskeletal Research Program, Griffith University, Gold Coast Campus, Queensland 4222, Australia.
J Biomech. 2011 Sep 2;44(13):2496-500. doi: 10.1016/j.jbiomech.2011.06.008. Epub 2011 Jul 16.
Individuals with spastic cerebral palsy (SCP) exhibit restricted joint range of motion and increased joint stiffness due to structural alterations of their muscles. Little is known about which muscle-tendon structures are responsible for these alterations. The aim of this study was to compare the passive mechanics of the ankle joint and medial gastrocnemius (MG) muscle in young adults with SCP and typically developed (TD) individuals. Nine ambulant SCP (17±2 years) and ten TD individuals (18±2 years) participated in the study. Physiological cross sectional area was estimated using freehand 3D ultrasound and found to be 37% lower in the SCP group. An isokinetic dynamometer rotated the ankle through its range while joint torque and ultrasound images of the MG muscle fascicles were simultaneously measured. Mean ankle stiffness was found to be 51% higher and mean MG fascicle strain 47% lower in the SCP group. Increased resistance to passive ankle dorsiflexion in SCP appears to be related to the inability of MG muscle fascicles to elongate with increased force.
痉挛性脑瘫（SCP）患者由于肌肉结构的改变而表现出受限的关节活动范围和增加的关节僵硬。对于哪些肌肉-肌腱结构负责这些改变，知之甚少。本研究的目的是比较年轻的 SCP 患者（17±2 岁）和典型发育（TD）个体的踝关节和内侧腓肠肌（MG）的被动力学。9 名 SCP（17±2 岁）和 10 名 TD 个体（18±2 岁）参与了这项研究。使用徒手 3D 超声估计生理横截面积，发现 SCP 组低 37%。等速测力计旋转踝关节通过其范围，同时测量 MG 肌束的关节扭矩和超声图像。发现 SCP 组的平均踝关节刚度高 51%，平均 MG 肌束应变低 47%。SCP 中被动踝关节背屈阻力增加似乎与 MG 肌束在增加力时无法伸长有关。
