Sacroiliac joint

Sacroiliac joint: Anatomy & FunctionAnatomy, functions, innervation and blood supply of the sacroiliac joint
~ 2 min

The sacrum is connected to the ilium by the sacroiliac joint (articulatio sacroiliaca).

Sacro-iliac joint (art. sacroiliaca)
Sacro-iliac joint (art. sacroiliaca)

This joint is formed between the auricular articular surface of the sacrum (facies auricularis) and the auricular articular surface of the ilium (also facies auricularis).

Articular surface of the sacrum (facies auricularis)
Articular surface of the sacrum (facies auricularis)
Articular surface of the sacrum (facies auricularis)
Articular surface of the sacrum (facies auricularis)
Auricular articular surface of the ilium (facies auricularis)
Auricular articular surface of the ilium (facies auricularis)

The joint capsule is attached along the edge of the articular surfaces. It is strong, fibrous, and strengthened with numerous ligaments.

According to the classification, the joint is plane, multiaxial, simple and combined (with the same joint of the opposite side).

The joint is virtually immobile due to the equal area of the articular surfaces and the strong ligamentous apparatus.

It consists of several ligaments:

  • The anterior sacroiliac ligament (ligamentum sacroiliacum anterius) passes obliquely from the pelvic surface of the sacrum to the ilium.

    Anterior sacroiliac ligament (lig. sacroiliacum anterius)
    Anterior sacroiliac ligament (lig. sacroiliacum anterius)
    Anterior sacroiliac ligament (lig. sacroiliacum anterius)
    Anterior sacroiliac ligament (lig. sacroiliacum anterius)
  • The posterior sacroiliac ligament (ligamentum sacroiliacum posterius) arises from the superior and inferior posterior iliac spines and attaches to the lateral crest of the sacrum.

    Posterior sacroiliac ligament (lig. sacroiliacum posterius)
    Posterior sacroiliac ligament (lig. sacroiliacum posterius)
    Posterior sacroiliac ligament (lig. sacroiliacum posterius)
    Posterior sacroiliac ligament (lig. sacroiliacum posterius)
  • The interosseous sacroiliac ligament (ligamentum sacroiliacum interosseum) is the strongest, it fuses with the posterior surface of the articular capsule, filling the gap between the sacral and iliac tuberosities.

    Interosseous sacro-iliac ligament (lig. sacroiliacum interosseum)
    Interosseous sacro-iliac ligament (lig. sacroiliacum interosseum)
  • The iliolumbar ligament (ligamentum iliolumbale) arises from the transverse processes of the lumbar vertebrae

    4-5. It inserts into the crest of the ilium and its tuberosity.

    Ilio-lumbar ligament (lig. iliolumbale)
    Ilio-lumbar ligament (lig. iliolumbale)
    Ilio-lumbar ligament (lig. iliolumbale)
    Ilio-lumbar ligament (lig. iliolumbale)

    This joint has no additional structures.

    The following vessels and nerves take part in the blood supply and innervation of the joint.

  • Arteries: lumbar arteries 3-4 (art. lumbales III-IV), internal iliac artery (a. iliaca interna), external iliac artery (a. iliaca externa)

  • Veins: internal iliac vein (v. iliaca interna)

  • Nerves: sensory fibers from the sacral plexus (plexus sacralis)

Dictionary

Sacroiliac joint

Sacroiliac joint
art. sacroiliaca
Sacrum
os sacrum
Ilium
os ilium
Auricular surface
facies auricularis
Anterior sacroiliac ligament
lig. sacroiliacum anterius
Posterior sacroiliac ligament
lig. sacroiliacum posterius
Interosseous sacroiliac ligament
lig. sacroiliacum interosseum
Iliolumbar ligament
lig. iliolumbale
Lumbar arteries 3-4
art. lumbales III-IV
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