Computed Tomography for Evaluating Supination-external Rotation Type Ankle Fractures

Comparison of a Novel Weight Bearing Cone-beam Computed Tomography (CT) Scan to Gravity Stress X-ray for Determining Instability of Supination-external Rotation Type Ankle Fractures

To compare measures of ankle stability from an investigational cone beam computed tomography scanner to gravity stress X-ray in patients who have unstable supination-external rotation ankle fractures.

Inclusion Criteria:

• willing & able to provide written informed consent
• at least 18 years-old
• have medial clear space measuring less than 5 mm with clinical suspicion of instability and would normally require a gravity stress X-ray

Exclusion Criteria:

• pregnant (females)
• prisoners
• open fracture
• clinical signs of foot deformity
• previous foot trauma or surgery on the affected foot
• significant osteoarthritis or pre-existing ligamentous instability or pain in the affected foot
• unable to stand in the weight bearing position during the CT scan