Sadeghi Heydar, Allard Paul, Barbier Franck, Gatto Laura, Chavet Pascale, Rivard Charels Hivard, Hinse Sebastine, Simoneau Martine
Department of Kinesiology, Tarbiat Moallem University, Ministry of Sciences, Research and Technology, Tehran, Iran.
Med Sci Monit. 2008 Jun;14(6):CR293-298.
Since trunk morphology and curve types were reported to affect standing in adolescent idiopathic scoliosis (AIS), it is reasonable to assume that bracing could perturb standing balance in this population. The objective here was to use time- and frequency-domain analyses to test if the Boston brace affects balance in AIS.
MATERIAL/METHODS: Fifteen AIS girls were fitted with a Boston brace. At the four-month follow-up, standing balance was assessed using center of pressure (COP) displacements measured from a force plate. The subjects were tested with and without the brace.
The mean position of the COP and the sway area were similar with and without the brace. Though the first peak in the power spectra was not statistically significant, the second peak was statistically smaller with the brace in the antero-posterior direction (p=0.012) and larger along the medio-lateral axis (p=0.022). In the antero-posterior direction there was a statistically significant shift towards higher mean (p=0.012) and median (p=0.003) frequencies with the brace, whereas no difference was noted in the medio-lateral direction. Time-domain parameters did not prove useful in differentiating between the in- and out-of-brace conditions in AIS individuals. The second peak in the power spectra could be associated with an inverse double-pendulum motion.
The time-dependent parameters used in this study did not prove useful in differentiating between in-brace and out-of-brace conditions. Spectral analysis highlighted increased stiffness in the antero-posterior direction and less control in the medio-lateral axis in standing balance between in-brace and out-of-brace conditions in AIS.
由于已有报道称躯干形态和曲线类型会影响青少年特发性脊柱侧凸（AIS）患者的站立姿势，因此可以合理推测，支具可能会扰乱该人群的站立平衡。本研究的目的是通过时域和频域分析来测试波士顿支具是否会影响AIS患者的平衡。
材料/方法：15名AIS女孩佩戴波士顿支具。在4个月的随访中，使用测力台测量的压力中心（COP）位移来评估站立平衡。对受试者在佩戴和不佩戴支具的情况下进行测试。
佩戴和不佩戴支具时，COP的平均位置和摆动面积相似。虽然功率谱中的第一个峰值无统计学意义，但第二个峰值在前后方向上佩戴支具时在统计学上较小（p = 0.012），而在内外侧轴向上较大（p = 0.022）。在前后方向上，佩戴支具时平均频率（p = 0.012）和中位数频率（p = 0.003）有统计学意义的向更高值偏移，而在内外侧方向上未观察到差异。时域参数在区分AIS个体佩戴支具和不佩戴支具的情况时并无用处。功率谱中的第二个峰值可能与反向双摆运动有关。
本研究中使用的时间相关参数在区分佩戴支具和不佩戴支具的情况时并无用处。频谱分析突出显示，在AIS患者佩戴支具和不佩戴支具的站立平衡中，前后方向的刚度增加，内外侧轴向上的控制减少。
