A rapid side-to-side repositioning procedure for posterior canal BPPV. An alternative to the Epley maneuver, performed with a single fast movement rather than sequential positions.
Medical definition
Described by Alain Semont in 1988, the Semont maneuver (also called the liberatory maneuver) treats posterior canal canalithiasis using a different mechanical principle than the Epley maneuver. The patient is seated sideways at the edge of the table, rapidly moved to lie on the affected ear (triggering vertigo), held for 3 minutes, then swiftly swung 180 degrees to lie on the opposite shoulder (head now facing down toward the floor), held again for 3 minutes, then returned upright. The rapid movement is intended to dislodge crystals from the cupula or canal by inertia. A modified “fast Semont” maneuver completes the same arc in under 1.5 seconds and is reported to have higher first-attempt success rates in some studies.
Why it matters for vertigo
The Semont maneuver is particularly useful for patients with posterior canal cupulolithiasis (crystals stuck to the cupula rather than floating), where the Epley maneuver is less effective. It is also used when patients have neck or back mobility restrictions that make the sequential Epley positions difficult. The evidence base is slightly smaller than for the Epley maneuver, but success rates in skilled hands are comparable — roughly 70 to 85% after a single session. The main limitation is that the sudden rapid movement can cause significant nausea, making it less comfortable for some patients.
Where I see this in clinic
I use the Semont maneuver selectively — mainly when a patient has posterior canal BPPV that did not respond to the Epley on the first or second attempt, or when I suspect cupulolithiasis rather than canalithiasis based on the nystagmus pattern (direction-changing or persistent rather than geotropic and fatigable). For in-person cases in Hardoi, having both maneuvers available lets me choose based on what the Dix-Hallpike tells me rather than defaulting to one technique for all posterior canal cases. The Semont is not appropriate to attempt at home without a clinical assessment first.
Related terms
Epley maneuver — the first-line alternative for posterior canal canalithiasis. Canalithiasis — the mechanism both maneuvers treat. Cupulolithiasis — the variant where the Semont may have an advantage. Semicircular canals — the anatomy both maneuvers work through.
Medical Disclaimer: This glossary entry is for educational purposes only. Repositioning maneuvers should be performed or supervised by a clinician after confirming the diagnosis. Consult Dr. Prateek Porwal directly. WhatsApp: 7393062200.