Christopher D Stephen1, Criscely L Go2, Patrick Acuna1, Nutan Sharma1. 1. Dystonia Clinic and Movement Disorders Unit Department of Neurology, Massachusetts General Hospital and Harvard Medical School Boston MA USA. 2. Department of Behavioral Medicine Jose Reyes Memorial Medical Center Manila Philippines.
Abstract
BACKGROUND: X-linked dystonia parkinsonism (XDP) is a rare disorder characterized by adult-onset, progressive dystonia that, over time, is combined with or replaced by features of parkinsonism. Gait impairment is common. METHODS: Case series of 4 XDP patients with a unique gait disorder. RESULTS: The patients displayed a characteristic gait disorder with combined dystonic and parkinsonian gait features, with phasic knee bending. Of these patients, all had parkinsonism and three-quarters had prominent dystonic features, but 1 had predominant parkinsonism and subtle dystonic features. CONCLUSION: Although XDP is a classic form of dystonia parkinsonism, some cases can mimic idiopathic Parkinson's disease. We describe a gait disorder which appears unique to XDP, involving phasic dystonic knee bending superimposed on parkinsonian shuffling, and may help clinically differentiate one of our parkinsonian-predominant patients from more-common forms of parkinsonism. The gait is distinct from other complex dystonic disorders with gait involvement.
BACKGROUND: X-linked dystonia parkinsonism (XDP) is a rare disorder characterized by adult-onset, progressive dystonia that, over time, is combined with or replaced by features of parkinsonism. Gait impairment is common. METHODS: Case series of 4 XDP patients with a unique gait disorder. RESULTS: The patients displayed a characteristic gait disorder with combined dystonic and parkinsonian gait features, with phasic knee bending. Of these patients, all had parkinsonism and three-quarters had prominent dystonic features, but 1 had predominant parkinsonism and subtle dystonic features. CONCLUSION: Although XDP is a classic form of dystonia parkinsonism, some cases can mimic idiopathic Parkinson's disease. We describe a gait disorder which appears unique to XDP, involving phasic dystonic knee bending superimposed on parkinsonian shuffling, and may help clinically differentiate one of our parkinsonian-predominant patients from more-common forms of parkinsonism. The gait is distinct from other complex dystonic disorders with gait involvement.
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