It is not uncommon for there to be difficulty distinguishing traumatic from congenital radial head dislocation. Factors that can help in the diagnosis include:
Feature | Congenital dislocation | Traumatic Dislocation |
History of trauma | occasionally | always |
Family history | often | none |
Bilateral | common | rare |
Other anomalies | common | rare |
Radial head | Dome shaped for anterior dislocations, narrow for posterior dislocations | Normal shape with concavity |
Ulna | shortened; may be bowed | normal |
Capitellum | hypoplastic or absent | normal |
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