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Adult pelvis radiographs - Coggle Diagram

- - - - patient
        supine
        legs IR 15-20°
      - beam
        aim midway between ASIS + pubic symphysis
    - - pelvic/acetabular fractures
        assess 6 lines
        
        posterior rim (1) = posterior wall/column
        posterior horn of acetabulum
        more lateral + horizontal line
        
        anterior rim (2) = anterior wall/column
        inferior margin of superior pubic ramus
        more medial + horizontal line
        
        sourcil (3) = anterior/posterior column
        acetabular roof = superior weight-bearing portion
        normal 45-60° arc
        
        teardrop (4) = anterior/posterior column
        external/lateral limb = inferior anterior acetabular wall + outer cotyloid fossa
        lower border = ischiopubic/acetabular notch + superior obturator foramen
        internal/medial limb = outer wall of obturator canal + quadrilateral surface
        internal + external limbs = not in same coronal plane but usually parallel + forms U
        
        ilioischial line (5) = posterior column
        pelvic brim + quadrilateral surface + posterior obturator foramen + ischiopubic ramus
        always superimposed on teardrop = disruption 2/2 rotation vs. quadrilateral surface Fx
        
        iliopectineal line (6) = anterior column
        anterior ¾ = pelvic brim, pubic symphysis to ilioischial line
        posterior ¼ = lower ½ of sciatic buttress to roof of greater sciatic notch
    - - no pelvic tilt
        coccyx located 2cm above pubic symphysis
      - no rotation of pelvis
        sacrum in midline
        symmetrical greater trochanters + obturator foramen
      - no visualization of lesser trochanters
        too much external rotation of leg leads to increased visualization of lesser trochanter
        if lesser trochanters are visible, they should be of symmetrical size and shape
  - - - patient
        supine vs. lateral decubitus
      - beam
        aim 5cm above greater trochanters
    - - no superimposition of femurs + pubic arch
        achieve via leg extension
        
        superimposition of posterior ischium/ilium
        
        superimposition of femurs + acetabulum