
Fig 1: Pressure on the sacroiliac joint
(larger view)

Low back pain arising from a sacroiliac joint is most frequently caused by a trauma (such as a slip or fall) or the process of childbirth. At times, no clear historical event can be determined, often making a chiropractic or other type of diagnosis difficult by history alone.
For more information, see What is sacroiliac joint dysfunction?
The goal of chiropractic treatment for sacroiliac joint dysfunction is to utilize a method that is best tolerated by the patient with the goal of yielding the best outcome. Different patients respond better to different approaches, so chiropractors may adopt various chiropractic techniques to treat sacroiliac joint dysfunction.
The chiropractor’s contact hand is placed over the sacroiliac joint and pressure is applied while the patient’s upper shoulder is tractioned backward and the knee is tractioned towards the floor (see Figure 1).
When the slack is removed from the lumbar spine, and the pre-manipulation position is determined to be comfortable, a low force, high amplitude manipulation is applied by the chiropractor and usually results in an audible release (created by oxygen, nitrogen, and carbon dioxide escaping from the joint). This chiropractic maneuver creates the typical "crack" often associated with joint manipulation and sounds similar to "cracking the knuckles." (See Figure 2.)
While this description of a chiropractic manipulation by a chiropractor may give an impression of something that is uncomfortable, the sensation is usually quite relieving almost immediately. Patients who have been treated with this approach in the past often request this chiropractic procedure.