subluxation / vertebral subluxation

Subluxation  (sub·lux·a·tion) (sub"l?k-sa´sh?n) [ sub- + luxation ]  1. an incomplete or partial dislocation . See accompanying illustration.  2. in chiropractic, any mechanical impediment to nerve function; originally, a vertebral displacement believed to impair nerve function.

Cervical spine with anterior subluxation

Vertebral Subluxation

Vertebral subluxation is the
malfunction of organs or tissues caused by impairment of nerve function that results from restriction of normal motion or from abnormal position of spinal segments.