- Discussion:
- demonstrates the middle and posterior facet of sub-talar joint;
- taken with the foot dorsiflexed, inverted, and internally rotated 60 deg;
- Broden described a similar projection w/ limb internally rotated 45 deg;
- he recommended taking 4 exposures with the x-ray tube angled 40 degrees, 30 deg, 20 deg, and 10 deg cephalad to see all aspects of posterior facet from front to back;
- Technique:
- patient is supine;
- foot is passively dorsiflexed with a strap, inverted, and internally rotated 60 deg;
- central beam centered 1 inch anterior and 1 inch distal to the tip of the lateral malleolus with a 10 deg cephalic tilt;
- roentgenogram is tilted 10 deg cephalad and centered 1 inch anterior and 1 inch distal to the tip of the lateral malleolus