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what exactly is Radioulnar Synostosis?
X-ray of CRUS(Image source: Orthobullets)
Congenital Radioulnar Synostosis
Congenital Radioulnar Synostosis is a rare medical condition that comes from the radial and ulnar bones in the forearm not separating completely during the seventh week of gestation.
More males have been diagnosed with RUS than females(3:2), and 60% of people with RUS have it in both arms(bilateral RUS).
20% of people with RUS have family members who will also have the condition, but RUS can also be associated with other genetic syndromes about 30% of the time.
On average, people will be diagnosed at 6 years old, but many with RUS in one arm will go undiagnosed because they have compensated with shoulder movements or adapted certain actions.
Radioulnar Synostosis
Radioulnar Synostosis can also happen after physical trauma in 3-9% of cases. This often happens after a bone fracture or delayed treatment, and the X-ray image of the bone fusion will look quite different from Congenital RUS.Â
In some cases, it can also result from surgery in the forearm.
X-ray of RUS from trauma(image credit orthobullets)
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