Superior iliac spine

Anatomical landmark on the pelvis

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Right hip bone. External surface. (Superior iliac spine visible at top center.)

Details
Synonyms
Pronunciation
Carnegie stage
Days
Precursor	Ilium
Gives rise to
Part of

The superior iliac spine refers to two anatomical landmarks on the pelvis: the anterior superior iliac spine (ASIS) and the posterior superior iliac spine (PSIS). These structures are important reference points in anatomy and are used in various medical and clinical settings.

Anterior Superior Iliac Spine (ASIS)

The anterior superior iliac spine is a bony projection of the iliac bone and is located on the anterior (front) part of the iliac crest. It serves as an important landmark for several clinical procedures and is the attachment point for the inguinal ligament and the sartorius muscle.

Clinical Significance

The ASIS is used as a reference point in the measurement of leg length and in the diagnosis of certain conditions such as pelvic obliquity. It is also a key landmark in the identification of the McBurney's point, which is used in the diagnosis of appendicitis.

Posterior Superior Iliac Spine (PSIS)

The posterior superior iliac spine is located on the posterior (back) part of the iliac crest. It is less prominent than the ASIS but serves as an important landmark in the assessment of pelvic alignment and in the diagnosis of sacroiliac joint dysfunction.

Clinical Significance

The PSIS is often used as a reference point in the assessment of scoliosis and other spinal deformities. It is also a key landmark in the administration of certain types of spinal anesthesia.

Related Structures

• Iliac crest
• Pelvis
• Inguinal ligament
• Sartorius muscle
• Sacroiliac joint
• McBurney's point

See Also

• Pelvic bone
• Skeletal system
• Anatomical terms of location