• Lateral mass fracture
• Medial epicondyle avulsion
• Capitellar fracture
• Radial head
• Radiocapitellar subluxation
• Joint effusion
KEY POINTS
Look for a lucent line ‘parallel’ to the capitellar physis
Know your CRITOL
Avulsion is easy, unless the fragment is pulled into the joint.
If you see a ‘trochlea’ without a medial epicondyle, consider an avulsion
There should be no sharp angles in the capitellar contour
Effusion is the best clue for radial head fracture
The axis of the very proximal radius should pass through the capitellum
If not consider subluxation
The posterior fat pad is not normally visible.
The anterior fat pad is unreliable.
In a child, effusion often means a supracondylar fracture