A patient has a decreased step height and length with increased step speed.He appears to hesitate both in initiating and in terminating ambulation.Which pathology is he most likely experiencing?

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A patient with Parkinson's disease has a decreased step height and length,but increased step speed,resulting in shuffling.The posture is stooped.There is a hesitation to begin to terminate walking.The patient assumes a rigid body posture,with flexion of the knees during standing and ambulation.The gait of a patient with multiple sclerosis is called a scissors gait: adduction at the knee level produces short,slow steps; gait is uncoordinated,stiff,and jerky; foot is dragged across the floor in a semicircle.A patient with cerebellar disease has a broad-based gait that is uncoordinated,and he appears to stagger and sway during ambulation.The patient with Alzheimer's disease has difficulty with walking despite intact motor and sensory systems.The patient is unable to initiate walking,as if stuck to the floor.After walking is initiated,the gait is slow and shuffling.

A Patient Has a Decreased Step Height and Length with Increased