Upright images in cases of sacroiliac slip or relaxation:
- a conventional lateral position centered to the lumbosacral junction .
- Two PA projections of the pubic bones with the patient in upright position and with weight – bearing on the alternate legs
– this examination requires two blocks or box tools approximately 6 inches high and removed to allow one leg to hang free.
Film: 8 x 10 (18 x 24 cm)
Position of patient
- patient in PA position standing on the two blocks before a vertical grid device
- adjust the height of the grid and center the film to the symphysis pubis
Position of part
- midsagittal plane of the body is centered to the midline of the grid, adjust the body in AP position
- allow the patient grasp the sides of the device to steady himself/herself unless contraindicated
- a compression band may be placed across the pelvis to immobilize he patient
- remove one of the blocks so that one leg hangs free and instruct the patient to hand his/her leg for the first exposure
- replace the first support and remove the opposite one for the 2nd exposure
- respiration is suspended
Central ray
- direct the CR perpendicularly and centered to the pubic sumphysis
Structure shown
- two PA projection of the pubic bones are shown and any abnormal motion of the sacroiliac joints
Evaluation criteria
- symphysis pubis should be in the center of the radiograph and patient should not be rotated
