Abasia (from

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

: ''a-'', without and ''basis'', step) is the inability to walk owing to impairment in motor coordination. The term covers a spectrum of medical disorders such as: * choreic abasia: caused by

chorea Chorea (or choreia, occasionally) is an abnormal involuntary movement disorder, one of a group of neurological disorders called dyskinesias. The term ''chorea'' is derived from the grc, χορεία ("dance"; see choreia), as the quick movem ...

of the legs * paralytic abasia: caused by paralysis of the leg muscles * spastic abasia: caused by spastic stiffening of the leg muscles * trembling abasia: caused by

trembling A tremor is an involuntary, somewhat rhythmic, muscle contraction and relaxation involving oscillations or twitching movements of one or more body parts. It is the most common of all involuntary movements and can affect the hands, arms, eyes, f ...

of the legs Abasia is frequently accompanied by astasis, an inability to stand, see Astasia-abasia.

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