BACKGROUND We aimed to determine the effect of cueing an increase or decrease in the vertical ground reaction force impact peak (peak in the first 50% of stance) on vertical ground reaction force, knee flexion angle, internal knee extension moment, and internal knee abduction moment waveforms throughout stance in individuals 6-12 months after an anterior cruciate ligament reconstruction. METHODS Twelve individuals completed 3 conditions (High, Low, and Control) where High and Low Conditions cue a 5% body weight increase or decrease, respectively, in the vertical ground reaction force impact peak compared to usual walking. Biomechanics during High and Low Conditions were compared to the Control Condition throughout stance. FINDINGS The High Condition resulted in: (a) increased vertical ground reaction forces at each peak and decreased during mid-stance, (b) greater knee excursion (i.e., greater knee flexion angle in early stance and a more extended knee in late stance), (c) greater internal extension moment for the majority of stance, and (d) lesser second internal knee abduction moment peak. The Low Condition resulted in: (a) vertical ground reaction forces decreased during early stance and increased during mid-stance, (b) decreased knee excursion, (c) increased internal extension moment throughout stance, and (d) decreased internal knee abduction moment peaks. INTERPRETATION Cueing a 5% body weight increase in vertical ground reaction force impact peak resulted in a more dynamic vertical ground reaction force loading pattern, increased knee excursion, and a greater internal extension moment during stance which may be useful in restoring gait patterns following anterior cruciate ligament reconstruction.

中文翻译：

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前十字韧带重建后 6-12 个月，在整个步态中操纵峰值垂直地面反作用力的生物力学效应。


背景我们的目的是确定提示垂直地面反作用力冲击峰值（姿势的前 50% 中的峰值）的增加或减少对垂直地面反作用力、膝关节屈曲角度、膝关节内伸力矩和膝关节内外展的影响。前十字韧带重建后 6-12 个月个体整个站立过程中的力矩波形。方法 12 个人完成了 3 种条件（高、低和控制），其中高和低条件提示与平常行走相比，垂直地面反作用力冲击峰值的体重分别增加或减少 5%。将高条件和低条件下的生物力学与整个姿势的控制条件进行比较。结果 高条件导致：(a) 每个峰值处的垂直地面反作用力增加，并在中间站立期间减少，(b) 更大的膝关节偏移（即，早期站立时膝关节弯曲角度更大，站立后期膝关节伸展更大） ，(c) 大多数姿势的内伸展力矩较大，(d) 第二个内膝外展力矩峰值较小。低条件导致：(a) 垂直地面反作用力在站立初期减少，在站立中期增加，(b) 膝关节偏移减少，(c) 整个站立期间内伸展力矩增加，以及 (d) 膝关节内外展力矩减少峰。解释提示垂直地面反作用力冲击峰值体重增加 5% 会导致更动态的垂直地面反作用力负载模式、增加膝关节偏移以及站立期间更大的内伸展力矩，这可能有助于恢复前十字形后的步态模式韧带重建。