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...Radiographic positioning summary basic projections rad lower extremity projection ffd patient part position central ray cr grid breathing remarks center point cp instructions pt lies supine on table visualization of the id marker align msp to line or ir perpendicular pelvic girdle l sacrum and coccyx internally rotate long axis entire legs femoral head neck greater ap pelvis midway between level trochanter should be included is placed so that its top edge inch asiss symphysis pubis lesser not visible at above iliac crest all no rotation symmetric appearance wings following visualized midfemoral affected yes n a proximal one rd femur hip inches side in acetabulum adjacent parts unilateral through ischium ilium r leg appear without foreshortening collimation field demonstrate joint include either knee centered midline case including mid distal rotated degree medially for midpoint caudad thin thighs tibia fibula average full extension degrees cephalic thick femortibial space open true cm ...