Progress and Prospects in Parkinson's Research/Symptoms/Foot Drop

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Foot Drop or (Drop Foot)
Locomotion defect whereby the heel of a foot is raised from the ground while walking

The following references are relevant:-

Belfiore and Campanella (1994)  A clinical sign of Parkinson's disease: the absence of lateral foot drop 

Rogers et al (2011)  Perturbations of ground support alter posture and locomotion coupling during step initiation in Parkinson's disease 

The following references are relevant:-