Bouchouras Georgios, Patsika Glykeria, Hatzitaki Vassilia, Kellis Eleftherios
Motor Control and Learning Laboratory, Faculty of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Greece.
Laboratory of Neuromechanics, Faculty of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Greece.
Clin Biomech (Bristol). 2015 Jul;30(6):599-607. doi: 10.1016/j.clinbiomech.2015.03.025. Epub 2015 Mar 30.
The purpose of this study was to compare joint kinematics, knee and trunk muscle activation and co-activation patterns during a sit-to-stand movement in women with knee osteoarthritis and age-matched controls.
Eleven women with knee osteoarthritis (mean and standard deviation, age: 66.90, 4.51 years, height: 1.63, 0.02 m, mass: 77.63, 5.4 kg) and eleven healthy women (mean and standard deviation, age: 61.90, 3.12 years, height: 1.63 m, 0.03, mass: 78.30, 4.91 kg) performed a Sit to Stand movement at a self-selected slow, normal and fast speed. Three-dimensional joint kinematics of the lower limb, vertical ground reaction forces and electromyographic activity of the biceps femoris vastus lateralis and erectus spinae were recorded bilaterally.
A two-way ANOVA showed that the osteoarhtitis group performed the sit to stand task using a smaller knee and hip range of motion compared with the control group while no differences in temporal kinematics and ground reaction force-related parameters were observed. In addition, women with osteoarhtritis displayed significantly lower vastus lateralis coupled with a higher biceps feomoris electromyographic activity and higher agonist-antagonist co-contraction and co-activation than asymptomatic women. The activation of erectus spinae was not different between groups.
Results indicate that patients with moderate knee osteoarthritis rise from the chair using greater knee muscle co-contraction, earlier and greater activation of the hamstrings which results in reduced hip and knee range of motion. This may be a way to overcome the pain and potential muscle atrophy of knee extensor muscles without compromising overall task duration.
本研究的目的是比较膝关节骨关节炎女性与年龄匹配的对照组在从坐到站动作过程中的关节运动学、膝关节和躯干肌肉激活及协同激活模式。
11名膝关节骨关节炎女性（平均年龄和标准差：年龄66.90岁，4.51岁；身高1.63米，0.02米；体重77.63千克，5.4千克）和11名健康女性（平均年龄和标准差：年龄61.90岁，3.12岁；身高1.63米，0.03米；体重78.30千克，4.91千克）以自我选择的慢、正常和快速速度进行从坐到站动作。双侧记录下肢的三维关节运动学、垂直地面反作用力以及股二头肌、股外侧肌和竖脊肌的肌电图活动。
双向方差分析显示，与对照组相比，骨关节炎组在进行从坐到站任务时膝关节和髋关节的活动范围较小，而在时间运动学和地面反作用力相关参数方面未观察到差异。此外，与无症状女性相比，骨关节炎女性的股外侧肌活动明显较低，股二头肌肌电图活动较高，且激动剂 - 拮抗剂协同收缩和协同激活更高。两组之间竖脊肌的激活没有差异。
结果表明，中度膝关节骨关节炎患者从椅子上起身时使用了更大的膝关节肌肉协同收缩，更早且更大程度地激活了腘绳肌，这导致髋关节和膝关节活动范围减小。这可能是一种在不影响整体任务持续时间的情况下克服膝关节伸肌疼痛和潜在肌肉萎缩的方法。
