Medical Information
What exactly is Radioulnar Synostosis (RUS)?
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Radioulnar synostosis symptoms include not being able to fully turn the palm up or down, as well as accompanying pain. There are largely two types of RUS:
Congenital Radioulnar Synostosis
Congenital Radioulnar Synostosis (CRUS) is a rare medical condition. It occurs because two bones(the radial and ulnar bones) in the forearm are fused near the elbow. While the two bones are initially connected during the early stages of pregnancy, they normally separate into individual bones between the fifth and eight weeks of gestation.
25% of people with RUS have family members who will also have the condition. However, RUS is associated with other genetic syndromes about 30% of the time.
More males have been diagnosed with RUS than females (3:2). Additionally, 60-80% of people with RUS have it in both arms (bilateral RUS).
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.
Pictured: A X-Ray of CRUS (Image source: Orthobullets)
Post-traumatic 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.
In some cases, it can also result from surgery in the forearm.
Pictured : A X-Ray of RUS from trauma (Image Source: Orthobullets)
For a more comprehensive text on RUS alongside patient experiences, check out this research paper: https://drive.google.com/file/d/1eQtyw6A3kFgpnuup5bMzcrmaQ5knUKp5/view
Sources:
https://drive.google.com/file/d/1eQtyw6A3kFgpnuup5bMzcrmaQ5knUKp5/view
https://www.childrenshospital.org/conditions/radioulnar-synostosis#:~:text=Radioulnar%20synostosis%20is%20a%20rare,a%20forearm%20fracture%20or%20trauma.
https://www.orthobullets.com/hand/6071/congenital-radial-ulnar-synostosis
https://www.orthobullets.com/trauma/1026/radioulnar-synostosis?section=bullets
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