Pelvic x-ray interpretation

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  • pubic symphysis: up to 5mm in width, up to 2mm offset, no overlap
  • SI joints: 2-4 mm in width


  • obturator foramina for symmetry-clue for rotation of film
  • diastasis of pubic symphysis and both SI joints
  • assymetry of illiac wings (rotation or deformity)
  • sacral foramina-especially the superior cortical margins
  • transverse processes of L5
  • integrity of all cortical lines, especially around acetabulum.


  • Outlet views-sacral fractures, SI joint abnormalities
  • Inlet view-displacement of ant. Fragments into pelvis..
  • (posterior abnormalities usually need CT )

See Also