Department of Physical Education and Sport Sciences, University of Mazandaran, Iran.
J Sci Med Sport. 2009 Nov;12(6):679-84. doi: 10.1016/j.jsams.2008.05.001. Epub 2008 Sep 3.
Changes in magnitude and timing of rearfoot eversion and tibial internal rotation by foot orthoses and their contributions to vertical ground reaction force and knee joint moments are not well understood. The objectives of this study were to test if orthoses modify the magnitude and time to peak rearfoot eversion, tibial internal rotation, active ground reaction force and knee adduction moment and determine if rearfoot eversion, tibial internal rotation magnitudes are correlated to peak active ground reaction force and knee adduction moment during the first 60% stance phase of running. Eleven healthy men ran at 170 steps per minute in shod and with foot orthoses conditions. Video and force-plate data were collected simultaneously to calculate foot joint angular displacement, ground reaction forces and knee adduction moments. Results showed that wearing semi-rigid foot orthoses significantly reduced rearfoot eversion 40% (4.1 degrees ; p=0.001) and peak active ground reaction force 6% (0.96N/kg; p=0.008). No significant time differences occurred among the peak rearfoot eversion, tibial internal rotation and peak active ground reaction force in both conditions. A positive and significant correlation was observed between peak knee adduction moment and the magnitude of rearfoot eversion during shod (r=0.59; p=0.04) and shod/orthoses running (r=0.65; p=0.02). In conclusion, foot orthoses could reduce rearfoot eversion so that this can be associated with a reduction of knee adduction moment during the first 60% stance phase of running. Finding implies that modifying rearfoot and tibial motions during running could not be related to a reduction of the ground reaction force.
足矫形器对后足外翻和胫骨内旋幅度及时间的改变，以及它们对垂直地面反作用力和膝关节力矩的影响尚不清楚。本研究的目的是检验矫形器是否会改变后足外翻、胫骨内旋、主动地面反作用力和膝关节内收力矩的幅度和峰值时间，并确定在跑步的前 60%支撑阶段，后足外翻和胫骨内旋幅度是否与峰值主动地面反作用力和膝关节内收力矩相关。11 名健康男性以 170 步/分钟的速度穿着鞋和使用足矫形器进行跑步。视频和力板数据同时采集，以计算足关节角位移、地面反作用力和膝关节内收力矩。结果表明，穿半刚性足矫形器可使后足外翻减少 40%（4.1 度；p=0.001）和峰值主动地面反作用力减少 6%（0.96N/kg；p=0.008）。在两种情况下，峰值后足外翻、胫骨内旋和峰值主动地面反作用力的时间均无显著差异。在穿鞋和穿鞋/矫形器跑步两种情况下，峰值膝关节内收力矩与后足外翻幅度呈正相关（r=0.59；p=0.04）。结论：足矫形器可以减少后足外翻，从而使跑步前 60%支撑阶段的膝关节内收力矩减少。这表明，在跑步过程中改变后足和胫骨的运动并不能与地面反作用力的减少相关。
