Different muscle groups function in a synchronized and coordinated manner to perform a given task, wherein the activity of one muscle group affects that of another (1, 3). Osteoarthritis (OA) is a common, chronic joint disease characterized by pain, disability and progressive loss of function. It is the most common musculoskeletal complaint worldwide and is associated with significant health and welfare costs (2, 7). The knee is the most frequently affected joint of the lower limb and prevalence of knee OA increases with age (6). Several studies have shown that muscle recruitment patterns and neuromuscular efficiency are different for patients with OA compared to normal controls during simple closed chain activities (4). However, no studies have investigated frontal plane control or the modulation of control due to, for example, a change in time or distance in OA (5).

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