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Joseph Junewick, MD FACR
over 11 years ago
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Radioulnar Synostosis

Case Detail

Anatomy: Musculoskeletal
Joseph Junewick, MD FACR
Diagnostic Category: Genetic or Congenital
Created: over 11 years ago
Updated: over 11 years ago
Tags: PEDS
Modality/Study Types: CR
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Infant with limited range of motion.

Case Images


Radioulnar sysostosis.


Dysmorphic posteriorly displaced proximal radius.
Bowed mid and distal radius with widened interosseous space.


The radius and ulna originate from a single block of mesenchyme which segments distal to proximal. Therefore, radioulnar synostosis almost always involves the proximal forearm. The fusion may not be evident in infancy secondary to incomplete ossification of the cartilaginous block. Radioulnar synostosis is often bilateral (>50%), more common in males, and occasionally associated with abnormal karyotype.


Ozonoff MB. Pediatric Orthopedic Radiology, 2nd Edition. WB Saunders Co 1992.

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