Kipp Kristof, Palmieri-Smith Riann M
Department of Physical Therapy, Marquette University, Milwaukee, WI 53201, USA.
Clin Biomech (Bristol). 2013 Jun;28(5):562-7. doi: 10.1016/j.clinbiomech.2013.03.008. Epub 2013 Apr 16.
People with chronic ankle instability display different ankle joint motions compared to healthy people. The purpose of this study was to investigate the strategies used to control ankle joint motions between a group of people with chronic ankle instability and a group of healthy, matched controls.
Kinematic data were collected from 11 people with chronic ankle instability and 11 matched control subjects as they performed a single-leg land-and-cut maneuver. Three-dimensional ankle joint angles were calculated from 100 ms before, to 200 ms after landing. Kinematic control of the three rotational ankle joint degrees of freedom was investigated by simultaneously examining the three-dimensional co-variation of plantarflexion/dorsiflexion, toe-in/toe-out rotation, and inversion/eversion motions with principal component analysis.
Group differences in the variance proportions of the first two principal components indicated that the angular co-variation between ankle joint motions was more linear in the control group, but more planar in the chronic ankle instability group. Frontal and transverse plane motions, in particular, contributed to the group differences in the linearity and planarity of angular co-variation.
People with chronic ankle instability use a different kinematic control strategy to coordinate ankle joint motions during a single-leg landing task. Compared to the healthy group, the chronic ankle instability group's control strategy appeared to be more complex and involved joint-specific contributions that would tend to predispose this group to recurring episodes of instability.
与健康人相比，慢性踝关节不稳患者表现出不同的踝关节运动。本研究的目的是调查一组慢性踝关节不稳患者和一组匹配的健康对照者在控制踝关节运动时所采用的策略。
收集了11名慢性踝关节不稳患者和11名匹配的对照受试者在进行单腿落地并切入动作时的运动学数据。从落地前100毫秒到落地后200毫秒计算三维踝关节角度。通过主成分分析同时检查跖屈/背屈、内旋/外旋和内翻/外翻运动的三维协变，研究踝关节三个旋转自由度的运动学控制。
前两个主成分方差比例的组间差异表明，对照组踝关节运动之间的角度协变更呈线性，而慢性踝关节不稳组则更呈平面性。特别是额状面和横断面运动导致了角度协变线性和平面性的组间差异。
慢性踝关节不稳患者在单腿落地任务中使用不同的运动学控制策略来协调踝关节运动。与健康组相比，慢性踝关节不稳组的控制策略似乎更复杂，涉及特定关节的作用，这往往使该组更容易反复出现不稳情况。
