Movement impairments, especially loss of the ability to maintain standing balance, adversely affect function and quality of life in patients with Parkinson’s disease.1,2 With progression of the disease, patients lose postural stability and have gait dysfunction, difficulty managing activities of daily living, and frequent falls.3,4 Although some motor dysfunction, such as tremor, may be alleviated with drug therapy, characteristics such as postural instability are less responsive to medication and require alternative approaches.5,6