AP PELVIS PROJECTION
Anteroposterior • Complete View • Pelvis and Hips Evaluation
Exposure Factors
Equipment: With bucky. Position: Supine.
Plate Size
Visible Anatomical Structures
Bony Pelvis
Complete
Both Hips
Coxofemoral joints
Proximal Femurs
Both femurs
Iliac Crests
Superior and inferior
Femoral Head
Head of femur
- Acetabular roof - Acetabular border
- Pubis rami - Superior and inferior pubis
- Sacroiliac joint - Both joints
- Pubic symphysis - Anterior pubic union
- Obturator foramen - Obturator hole
- Iliac spines - Posterosuperior, posteroinferior, anterosuperior
- Coccyx - Inferior end of spine
- Greater trochanters - Femoral projections
Patient Positioning
Central Ray Direction
Vertical and perpendicular to cassette center
Entry point: Midline at iliac crest level
Exit point: Pelvis center
Centering: Cassette center at pelvis center
Patient Instructions
"Hold your breath during exposure"
Maintain complete immobility - Do not move legs during exposure
Technical Considerations
Internal Rotation
15-20° internal rotation to visualize femoral neck without overlap.
Symmetry
Ensure perfect bilateral symmetry for comparative evaluation.
Centering
Center slightly superior to trochanters to include entire pelvis.
Clinical Indications
Key Image Evaluation Points
Symmetry
Both sides equally rotated and symmetrical
Inclusion
Entire pelvis and femoral heads included
Rotation
Femoral necks without overlap