Posterio oblique subsytem, AHmedbad, Lattismus dorsi

Posterior Oblique Subsystem (POS)

Before reading this article click on introduction to core subsystem 


Structures are involved :

  • Latissimus dorsi,
  • Thoracolumbar fascia,
  • Gluteus maximus
  • Superior portion or gluteus medius.


Function (Brief):

IT stabilize the posterior kinetic chain Which including lumbar spine and sacroiliac joint. It transfers the force between us upper extremity and lower extremities eventually, integrated pulling movement of a body.

  • Eccentric deceleration of total body
  • Transference of force between lower and upper extremities
  • Maintaining alignment of the lumbosacral joints
  • Maintaining femoral alignment during legs with pull


Functional Arthrokinematics:

This subsystem is an important stabilizer of the posterior kinetic chain.  The fiber arrangement in such a way i.e subsystem indicate a special role in sacroiliac joint (SIJ) arthrokinematics, and lumbo-sacral function.

The fibers of each side run perpendicular which crossing from the gluteus maximus and associated it’s respective fascia which  traversing the SIJ, through the nearly continuous thoracolumbar fascia, across the lumbar spine, to the latissimus dorsi and associated fascia on the opposite side.

During the swing phase of gait cycle, the eccentric control of leg and contralateral arm pulls the thoracolumbar fascia tight.  Concurrently, the contralateral Posterior oblique subsystem concentrically contracts throughout the gait cycle , which in turn pulls the contralateral side of the thoracolumbar fascia.

Optimal function of POS is to stabilize posture.


Motor Behavior:

The POS could be underactive termed in upper body dysfunction, Lumbo Pelvic hip complex dysfunction, sacroiliac joint dysfunction , and lower leg dysfunction. Commonly, the under-activity of the POS is paired with a synergistic dominance of the deep longitudinal subsystem (DLS – publish soon).


How to find  POS underactive?

AOS may be dominance seen in upper body dysfunction and who present lower leg dysfunction that results in excessive forward lean during the overhead squat assessment. It indicates POS is

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