- Discussion:
- larger than the anterior and middle facets and is convex in shape;
- tarsal canal separates the posterior facet from the anterior and middle facets;
- Radiographs:
-
medial oblique axial view:
- demonstrates middle & post facets of
sub-talar joint;
-
lateral oblique axial view
- demonstrates the posterior subtalar facet;
-
harris view:
- for visualizing
subtalar joint is enhanced by measuring angle of posterior facet on lateral view
& then adjusting
harris view to this inclination;
- angulation of
middle facet by > 20 degrees off horizontal is consistent with a coalition, even if the joint appears open;
Posterior subtalar joint arthrography. A useful tool in the diagnosis of hindfoot disorders.
