Postural instability is one of the most disabling symptoms of Parkinson’s disease (PD) and often leads to falls. Falls can have severe physical, psychological, and economic impacts including fractures, fear of falling, and loss of independence [1]. Effective interventions to reduce fall risk exist [2, 3] and would be most effective if they could be implemented prior to a fall occurring. Unfortunately, the current methods to evaluate postural instability in PD are not sensitive enough to predict those who are at an increased risk of falling so it is difficult to identify the best time to begin fall interventions.

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