A sign of sacroileitis. Two descriptions available: 1. Strong reaction of pain when demounting a horse fast.
2. Pain in the sacroiliac region when the patient sits down suddenly on a hard seat.
- D. J. Larrey:
Mémoires de chirurgie militaire, et campagnes. 4 volumes. Paris 1812-1817.
- Barry G. Firkin and Judith A. Whitworth:
Dictionary of Medical Eponyms. The Parthenon Publishing Group. 2002. Pp. 229-230.
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