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[Purpose] The purpose of this study was to clarify the external knee adduction moment (KAM) characteristics during stair descent by patients with knee osteoarthritis (OA). [Subjects] Ten patients with knee OA and 15 age-matched asymptomatic controls participated in this study. [Methods] Measurements were taken during stair descent and level walking using a three-dimensional motion analysis system. The maximum KAM, KAM integral and mean KAM values during the stance phase were calculated. [Results] No significant differences between the groups were observed in the maximum KAM, but the knee OA group demonstrated greater KAM integral in both stair descent and level walking. Mean KAM was significantly greater during stair descent in the knee OA group than in the controls; this effect was demonstrated during the single-leg support phase. [Conclusion] A marked increase in KAM of patients with knee OA was observed during stair descent, particularly in the single-leg support phase, when compared to level walking.

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Characteristics of External Knee Adduction Moment during Stair Descent and Level Walking: Comparison of Healthy Elderly People and Patients with Knee Osteoarthritis