ABSTRACT
Positioning for antero-posterior ankle (mortise) projection. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315382210/8ca82e7c-bd07-4171-b4f5-ebaded57b5b3/content/fig2_4a.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>
The patient is either supine or seated on the X-ray table, with both legs extended.
A pad may be placed under the knee for comfort.
The affected ankle is supported in dorsiflexion by a firm 90-degree pad placed against the plantar aspect of the foot. The limb is rotated medially (approximately 20 degrees) until the medial and lateral malleoli are equidistant from the receptor.
If the patient is unable to sufficiently dorsiflex the foot, raising the heel on a 15-degree wedge or using 5–10 degrees of cranial tube angulation can correct this problem.
The mid-tibia may be immobilised using a sandbag.
