Pelvis - AP

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Radiographic Positioning

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Name of projection Pelvis - AP
Area Covered Pelvic Girdle, L-5, Sacrum and Coccyx,Femoral Heads and Neck,Greater Trochanter
Pathology shown Fractures, Joint Dislocations, Degenerative Disease, Bone Lesions
Radiographic Anatomy Pelvis Radiographic Anatomy
IR Size & Orientation 35 x 43 cm
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
Filter Decubitus filter may be used for film
Not required with CR / DR
Exposure 75 kVp
20 mAs
FFD / SID 100cm
Central Ray CR perpendicular to IR
CR directed to midway level of ASIS(Anterior Superior Iliac Spine) and symphasis pubis
Collimation Collimate to lateral skin borders and to IR borders
Markers Distal and Lateral
Marker orientation AP
Shielding Shield gonads on all males,ovarian shielding on females is generally not possible without blocking essential anatomy (check your department's policy guidelines)
Respiration Suspended
  • Patient supine on the table, arms at side or across upper chest
  • Cushion for patients head
  • Midsagittal line of patient aligned to center line of table
  • Ensure pelvis is not rotated
  • Separate legs and feet
  • Internally rotate feet and legs 15° to 20° (do not attempt to internally rotate if fracture or dislocation suspected), sandbags may be used to maintain this position

  • Lesser trochanters should not be visible(many patients only tips are visible), Greater Trochanters should appear equal in size and shape.
Area Covered
  • See Above
  • Entire pelvic area demonstrated without foreshortening
  • Midsagittal line aligned with center of IR
  • Minimal borders on larger patients
  • Equal lateral borders lateral to greater trochanters on smaller patients
  • Optimal exposure has visible L-5 and sacrum
  • Margins of femoral heads and acetabula visible
  • Ishium and pubic bones not overexposed
  • Markings of femur and pelvis must appear sharp
Special Notes *** warning*** don't internally rotate legs and feet if dislocation or fracture is suspected

Reference Radiographic Positioning and Related Anatomy. Sixth Ed..Kenneth L. Botrager & John P. Lampignano.Elsevier Mosby.St. Louis,MO..2005 Pg.275