Research and Development Section, Department of Rehabilitation, Walter Reed National Military Medical Center, 4494 Palmer Rd N, Bethesda 20814, USA; Henry M. Jackson Foundation, for the Advancement of Military Medicine, 6720A Rockledge Dr, Bethesda 20817, USA.
Department of Kinesiology, University of Maryland, 2351 SPH Building, 4200 Valley Dr, College Park 20742, USA; Neuroscience & Cognitive Science Program, University of Maryland, College Park, USA.
Gait Posture. 2022 Feb;92:284-289. doi: 10.1016/j.gaitpost.2021.11.032. Epub 2021 Nov 26.
Continuous relative phase and vector coding are two common approaches for quantifying lumbopelvic coordination and variability. Evaluating the application of such methodologies to the lower limb loss population is important for better understanding reported asymmetrical movement dynamics of the lumbopelvic region.
How do coordination variabilities derived from trunk-pelvic coupling angles and continuous relative phases compare among individuals with and without unilateral lower limb loss walking at self-selected speeds?
Full-body kinematics were obtained from thirty-eight males with unilateral lower limb loss (23 transtibial and 15 transfemoral) and fifteen males without limb loss while walking along a 15 m walkway. Coordination variabilities were derived from trunk-pelvic coupling angles and continuous relative phases and compared using a multivariate approach, as well as in unilateral outcome measures between control participants and participants with lower limb loss.
Overall, tri-planar measures of continuous relative phase variability were 19-43% larger compared to coupling angle variabilities for individuals without limb loss and individuals with transtibial limb loss. Individuals with transfemoral limb loss had 27% and 31% larger sagittal and transverse variabilities from continuous relative phases compared to coupling angles, respectively. During both prosthetic and intact limb stance, individuals with transtibial limb loss had 19-35% greater tri-planar measures of continuous relative phase variability compared to coupling angle variabilities. During intact stance phase, tri-planar measures of continuous relative phase variability were 27%- 42% larger compared to coupling angle variabilities for individuals without limb loss.
While both methods provide valid estimates of lumbopelvic movement variability during gait, continuous relative phase variability may provide a more sensitive estimate in the lower limb loss population capturing velocity-specific motions of the trunk and pelvis.
连续相对相位和向量编码是两种常用的量化腰骶部协调和可变性的方法。评估这些方法在下肢缺失人群中的应用对于更好地理解报告的腰骶区域不对称运动动力学非常重要。
在以自我选择的速度行走的单侧下肢缺失和无下肢缺失的个体中，从躯干-骨盆耦合角度和连续相对相位得出的协调可变性有何不同？
从 38 名单侧下肢缺失（23 名胫骨截肢和 15 名股骨截肢）男性和 15 名无下肢缺失男性的全身体动学中获得数据，当他们沿着 15 米的走道行走时。使用多变量方法以及在对照组参与者和下肢缺失参与者之间的单侧结果测量中，从躯干-骨盆耦合角度和连续相对相位得出协调可变性，并对其进行比较。
总体而言，无肢体缺失和胫骨截肢个体的连续相对相位变异性的三轴测量值比耦合角度变异性大 19-43%。股骨截肢个体的矢状面和横断面连续相对相位变异性分别比耦合角度大 27%和 31%。在假肢和完整肢体支撑阶段，胫骨截肢个体的三轴连续相对相位变异性比耦合角度变异性大 19-35%。在完整的站立阶段，无肢体缺失个体的三轴连续相对相位变异性比耦合角度变异性大 27%-42%。
虽然这两种方法都提供了步态中腰骶部运动可变性的有效估计，但连续相对相位变异性可能为下肢缺失人群提供更敏感的估计，从而捕捉到躯干和骨盆的速度特异性运动。
