Preauricular groove

Dr Henry Knipe et al.

The preauricular groove or sulcus is a normal variant that is described to be characteristic of the bony female pelvis. It occurs at the insertion of the anterior sacroiliac ligament. 


The preauricular groove is present in ~25% of women and ~5% of men 1.

Radiographic features

The preauricular groove is in the inferior ilium adjacent to the sacro-iliac joint, and can vary from slightly concavity to a deep groove with overhanging edges 1,2

Anatomy: Spine
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Article information

rID: 44083
Section: Anatomy
Tag: cases, refs
Synonyms or Alternate Spellings:
  • Preauricular sulcus
  • Paraglenoid sulcus
  • Pre-auricular groove
  • Pr-eauricular sulcus

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