Foot (DP talus view)

The medial oblique, axial talus view,also known as the Canale view,is a specialised projection of the talus bone, more specifically the talar neck.

Indications

This view is specifically indicated when assessing fractures of the talar neck, or following fracture and/or their follow-up fixation of said injury. It is particularly useful to assess varus displacement ^1,2.This projection is difficult to perform in the acute setting, however often utilised to assess both the effectiveness of reduction and the monitoring of avascular necrosisosteonecrosis ^2,3.

Patient position

• the patient may be supine or upright depending on comfort
• the affected leg must be flexed enough that the plantar aspect of the foot is resting on the image receptor
• the foot is everted 15° (the same as a medial oblique foot)

Technical factors 

• oblique, axial projection
• centring point and tube position
  • midfoot
  • the tube is angled 15° from vertical
• collimation
  • lateral to the skin margins
  • anterior to the midoot
  • posterior to the skin margins of the calcaneum
• orientation
  • portrait
• detector size
  • 18 cm x 24 cm
• exposure
  • 50-55 kVp
  • 3-4 mAs
• SID
  • 100 cm
• grid
  • no

Image technical evaluation

Clear undistorted view of the talus with clear visualisation of the talar neck 

Practical points

This projection is essentially a medial oblique foot with DP tube angulation. It is quite useful when performing follow-up imaging of talus fractures, and, if the patient can tolerate it (and CT isn'tis not an option) a great projection to use in the acute, suspected talus fracture, setting.