The coccygeus and levator ani are technically muscles of the pelvic floor, however, they are also muscles whose contraction forces cross the sacroiliac joint and therefore often tighten when a sacroiliac joint condition exists. The coccygeus attaches from the sacrum and coccyx to the ischial spine of the pelvic bone.
Even when the original reason for the sacroiliac stabilization is valid, often the human body overdoes it and tightens the musculature excessively and/or keeps it tight long after it needs to be, so the musculature becomes stuck in a chronic pattern of hypertonicity.
The treatment for a hypomobile sacroiliac joint (SIJ) joint is Grade IV joint mobilization (also known as arthrofascial stretching).
Because of the tendency of one sacroiliac joint (SIJ) to compensate for the other when motion is dysfunctional, typically both SIJs become dysfunctional.
The sacroiliac joint is unique in that it is a transitional joint between the sacrum of the spine and the ilium of the pelvic bone of the lower extremity.
Assessment/diagnosis of spinal joint dysfunction, whether it is a hypomobility or a hypermobility, is done via motion palpation.
The primary causes of spinal joint hypomobility can be divided into three types: taut soft tissue, bony obstruction, and jammed meniscoid body.
Joint dysfunction literally means “bad motion.” There are two types: too little motion termed a hypomobility; and too much motion termed a hypermobility.
The two most common causes of a hypomobile joint dysfunction are tight muscles, especially smaller, deeper intrinsic muscles, and fibrous adhesions.
Motion palpation is a specific form of passive (pin and stretch technique) assessment that challenges the intrinsic fascial tissue of the joint.
A joint functions to allow motion, so two forms of joint dysfunction exist: Hypomobile joint has restricted motion; Hypermobile joint has excessive motion.
Grades IV and V joint mobilization are essentially pin and stretch technique.
Bone “A” is pinned and then Bone “B” is moved relative to Bone “A.”