Stringhalt

Stringhalt is a sudden flexion of one or both hind legs in horses and donkeys, most easily seen while the animal is walking or trotting. It is most evident when backing up slowly, turning on the affected leg, or suddenly frightened. It can involve one or both hind legs. It is a spasmodic contraction of the lateral extensor tendons of the hind legs.

There are four forms of stringhalt:

  1. Australian stringhalt: a flatweed (Hypochaeris radicata) is the suspected cause
  2. Pseudostringhalt: the apparent result of a painful condition in the affected leg
  3. Unilateral stringhalt: cause unknown, but often relieved by section of the lateral extensor tendon
  4. Bilateral stringhalt: in two out of two affected horses necropsied, abnormal thalamus

Treatment varies.

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