**5. Gait disturbances**

Gait disturbances are the most common initial symptom (present in 90% of the patients) and initially characterized by unsteadiness, frequent falls, slowness of gait, with difficulty initiating and turning, as the disease advances, these transform into magnetic, slow, broad based, and short steps (with preserved arm swing). These gait disturbances are not usually associated with increase in tone, exaggerated reflexes or weakness and usually there is absence of primary sensorimotor deficits, cerebellar dysfunction, or involuntary movements, involving difficulty integrating sensory information about the position of the body in relation to its environment. The impairment should be symmetric unless coexisting musculoskeletal disorders (e.g., knees, hips, and spine) cause asymmetry.
