Ankle (lateral view)
The ankle lateral view is part of a three view ankle series; this projection is used to assess the distal tibia and fibula, talus, navicular, cuboid, the base of the 5 metatarsal and calcaneus.
This projection aids in evaluating fractures, dislocations and joint effusions surrounding the ankle joint, and helps to assess the severity of a calcaneal fracture by measuring the Böhler angle and Gissane angle.
- patient is in a lateral recumbent position on the table
- the lateral aspect of the knee and ankle joint should be in contact with the table resulting in the tibia lying parallel to the table
- the leg can be bent or straight
- foot in dorsiflexion
- place the opposite leg behind the injured limb to avoid over-rotation
- mediolateral projection
- centering point
- the bony prominence of the medial malleolus of the distal tibia
- detector size
- 18 cm x 24 cm
- 50-60 kVp
- 3-5 mAs
- 100 cm
Image technical evaluation
The distal fibula should be superimposed by the posterior portion of the distal tibia.
The talar domes should be superimposed allowing for adequate inspection of the superior articular surface of the talus.
The joint space between the distal tibia and the talus is open and uniform.
Superior-inferior malalignment of the superior aspect of the talus is resultant of the tibia not lying parallel to the image receptor. To adjust this, either lower the knee to suit the ankle better or place the ankle on a small wedge sponge to better suit the knee.
Anterior-posterior malalignment of the talar domes is due to over or under rotation of the foot. To adjust this, check that the heel or the toes are not raised too far up. If the patient cannot correct this position, it can be aided with a small wedge sponge.
In trauma, it may not be possible to place the patient as above, in these cases, the same principles can be applied with a modified horizontal beam view. The patient can remain supine with an image receptor placed vertically adjacent to the lateral aspect of the upright ankle, and the x-ray beam is directed horizontally, centered at the bony prominence of the medial malleolus of the distal tibia.