Efficacy of a C1-C2 self-sustained natural apophyseal glide (SNAG) in the management of cervicogenic headache.

Study Design: Randomized, double-blind, placebo controlled trial.

Objectives: To determine the effect of a C1-C2 self-sustained natural apophyseal glide (SNAG) on cervicogenic headache.

Background: Cervicogenic headache is a common condition causing significant disability.