Upright images in cases of sacroiliac slip or relaxation:

1. a conventional lateral position centered to the lumbosacral junction .
2. 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