Anterior Oblique subsystem (AOS)

The Anterior Oblique Subsystem (AOS) is comprised of:

External Obliques
Abdominal Fascia/Linea Alba
Contralateral Anterior Adductors
Internal Obliques
Rectus Abdominis


Function (Brief):

Stabilization of the anterior kinetic chain Which including the joints of the pubic symphysis, hip, and lumbar spine. It transfer force between lower and upper extremities.


Functional Arthrokinetic:


The Anterior Oblique Subsystem plays very important for stabilizing anterior kinetic chain. This subsystem has little effect on joint arthrokinematics .

The AOS is responsible for eccentric deceleration of rotation and extension of the lumbar and thoracic spine –  when there is asymmetrical movement pattern that may lead to facet joint and posterior disk compression and has been indicated in lumbar spine injury.


The AOS is also involved in eccentric deceleration of an anterior pelvic tilt, especially during standing and pushing motions. As an anterior pelvic tilt includes lumbar spine extension with little sacroiliac joint (SIJ) motion. If you find any change in pelvic rotation and SIJ dysfunction which may involve AOS involvement.

The AOS directly stabilizes the pubic symphysis. There is a most notable relationship in the AOS synergy relative to pubis symphysis joint is the fascial continuity.


It provides an optimal function to control of rotation with, superior/inferior glide, and other accessory motions at the pubic symphysis which associated with the normal pelvic torsion during gait.


What happen when AOS dysfunction occurs?

There is asymmetrical movement occur in the lumbar and thoracic spine, SI joint and pubic symphysis via rotation of the spine and/or innominate. This dysfunction may present as


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