Center for Health, Exercise and Sports Medicine, Department of Physiotherapy, 202-206 Berkley St., The University of Melbourne, Victoria 3010, Australia.
Gait Posture. 2013 Mar;37(3):460-2. doi: 10.1016/j.gaitpost.2012.08.008. Epub 2012 Sep 8.
Carrying loads while walking or using stairs is a common activity of daily living. Knee osteoarthritis is associated with increased external knee adduction moment (KAM) during walking, so understanding how the additional challenges of stairs and carrying loads impact these moments is of value. Sixteen healthy individuals performed three types of MOTION (walking, stair ascent, stair descent) under three LOAD conditions (no load, carrying a 13.6kg front load, carrying 13.6kg load in a backpack). Three-dimensional gait analysis was used to measure KAM. Results of ANOVA showed a significant main effect of both MOTION and LOAD on peak KAM (p<0.001), but no significant MOTION×LOAD interaction (p=0.250). Peak KAM during stair ascent was about two-times those seen in stair descent (p<0.001) and was significantly higher than those seen in walking (p<0.001). Conditions with LOAD generated significantly greater KAM as compared to the no-LOAD conditions (p<0.001). These findings suggest that carrying a load of moderate magnitude while climbing stairs significantly increases the peak KAM - a risk factor associated with knee osteoarthritis.
在行走或使用楼梯时搬运物品是日常生活中的常见活动。膝骨关节炎与行走时膝关节外展力矩（KAM）增加有关，因此了解楼梯和搬运物品带来的额外挑战如何影响这些力矩非常重要。16 名健康个体在三种 LOAD 条件下（无负载、携带 13.6kg 前负载、背负 13.6kg 背包）进行三种 MOTION（行走、上楼梯、下楼梯）。三维步态分析用于测量 KAM。ANOVA 的结果表明，MOTION 和 LOAD 对峰值 KAM 都有显著的主效应（p<0.001），但没有显著的 MOTION×LOAD 相互作用（p=0.250）。上楼梯时的峰值 KAM 大约是下楼梯时的两倍（p<0.001），明显高于行走时的峰值 KAM（p<0.001）。与无负载条件相比，负载条件下的 KAM 明显更高（p<0.001）。这些发现表明，在爬楼梯时携带中等重量的负载会显著增加峰值 KAM——这是与膝骨关节炎相关的一个危险因素。
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