Department of Physical Therapy, Virginia Commonwealth University, Richmond, VA.
Department of Physical Therapy, East Carolina University, Greenville, NC.
Med Sci Sports Exerc. 2019 Jul;51(7):1444-1450. doi: 10.1249/MSS.0000000000001915.
Elevated tibiofemoral joint (TFJ) contact forces have been linked to the development and progression of knee osteoarthritis. The primary objective of this study was to determine the association between peak TFJ shear and compression forces during running at different self-selected step frequencies (SF) in female recreational runners.
Fifty-five healthy female recreational runners ran at 2.98 m·s on an instrumented treadmill. Peak TFJ anterior shear force, peak axial TFJ compression force, and peak medial compartment TFJ compression force were estimated using a musculoskeletal model with inputs from 3D joint kinematics and inverse dynamics calculations. Three SF groups were generated using tertiles, and differences between the groups were compared using one-way ANOVA (α = 0.05).
Runners with an SF of ≥178 steps per minute demonstrated the lowest peak TFJ anterior shear force (P = 0.04), peak axial TFJ compression force (P = 0.01), and peak TFJ medial compartment compression forces (P = 0.01) compared with runners using lower SF.
Female recreational runners with low SF of ≤166 steps per minute experience greater TFJ contact forces. This study provides evidence of an association between SF and both shear and axial peak TFJ contact forces during running.
胫骨股骨关节（TFJ）接触力升高与膝关节骨关节炎的发生和进展有关。本研究的主要目的是确定在不同自我选择的步频（SF）下，女性休闲跑步者在跑步过程中 TFJ 剪切和压缩峰值力之间的关系。
55 名健康的女性休闲跑步者在装有仪器的跑步机上以 2.98m·s 的速度跑步。使用从 3D 关节运动学和反向动力学计算输入的肌肉骨骼模型来估计 TFJ 的峰值前向剪切力、峰值轴向 TFJ 压缩力和峰值内侧 TFJ 压缩力。使用三分位数生成三个 SF 组，并使用单向方差分析（α=0.05）比较组间差异。
与使用较低 SF 的跑步者相比，SF 大于等于 178 步/分钟的跑步者的 TFJ 前向剪切峰值力（P=0.04）、轴向 TFJ 压缩峰值力（P=0.01）和 TFJ 内侧压缩峰值力（P=0.01）最低。
SF 小于等于 166 步/分钟的女性休闲跑步者经历更大的 TFJ 接触力。本研究提供了 SF 与跑步时 TFJ 剪切和轴向峰值接触力之间存在关联的证据。
