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Lets breakdown the 2 words your are asking about.
I believe you are asking about the term "subluxation." A subluxation is an old term used by chiropractors used to imply a joint dysfunction. It was used because very often when a chiropractor finds a joint dysfunction the joint feels to be slightly out of place. Subluxations are used to describe dysfunctions within segments of the spine (i.e. a C4 subluxation is mal-positioned in comparison to C5 & C6). This term "subluxation" is used by medical doctors to describe a partially dislocated joint. When this term is used by a medical doctor it implies a more severe situation that when it is described by a chiropractor. This term when used by a medical doctor implies instability and may require aggressive interventions. A better term used for the chiropractic "subluxation" is either a segmental dysfunction or somatic dysfunction.
Iliosacral or sacroiliac describes a joint formed in the back of the pelvis. This joint is formed by the sacrum as it articulates with the ilium. Often this pain in this joint is described as being low Back pain that is just above the buttock on one side.
A chiropractor might use the term sacroliliac subluxation to describe a dysfunction of this sacroiliac joint that is believed to respond well to chiropractic adjustments (i.e. joint manipulation).
