Novel lower-extremity dexterity assessment for Parkinson's disease: validation against measures of arm dexterity and general mobility.

This task provides a simple assessment of lower extremity function that correlates with validated measures of dexterity, gait, and mobility. It provides objective, continuous data, is inexpensive, requires little technical expertise/equipment, has a small physical footprint, and can be administered quickly. These features increase the feasibility of implementing this assessment tool in clinical settings.Implications for rehabilitationWe introduce a novel task that captures lower extremity dexterity in individuals with Parkinson's disease (PD).The task is validated against gold standard measures of upper extremity dexterity, gait, and general mobility.Performance on the task is sensitive to known features of PD, including dopamine-mediated improvements and asymmetrical symptom presentation.The task is easy to implement and provides higher quality data compared to other common clinical assessments (e.g., MDS-UPDRS).