Power’s ratio

Power’s ratio

Atlanto-occipital dislocation

Classification

Definition

The distance of the basion to the posterior arch of C1, divided by the distance of the opisthion to the anterior arch of C1.

Interpretation

Power's ratio < 1 is one of the indications for atlanto-occipital dislocation.

Reference(s)

The Neurosurgeon's Handbook. Ed. G Samandouras. Oxford University Press, 2010.
Last modified on July 8, 2016 by Pieter Kubben
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