Hi jim,radicular signs is a report of either impingment of the nerve trunk or a compression of its root.These are confirmed by delivering a longitudinal pressure on the cortex which transfer the effect to the cervical spine.A compression of the incriminating nerve root would trigger radicular signs.It is called provocative test.Distraction of the spine along same axis is expected to relieve the symptom.Vertical oscilatory pressure on the spine in question could trigger localised or referred pain along the radicular course.I hope u know a plain xray could be a very good diagnostic measure.This is just in addition to what Dr demien has said.yelufem