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Radioulnar Synostosis
Case Detail
| Anatomy: Musculoskeletal |
 Joseph Junewick, MD FACR |
| Diagnostic Category: Genetic or Congenital |
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| Created: over 3 years ago |
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| Updated: over 2 years ago |
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| Tags:
PEDS
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| Modality/Study Types:
CR
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Activities:  PDF  ImageJA |
History
Infant with limited range of motion.
Case Images
Diagnosis
Radioulnar sysostosis.
Findings
Dysmorphic posteriorly displaced proximal radius.
Bowed mid and distal radius with widened interosseous space.
Discussion
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.
Reference
Ozonoff MB. Pediatric Orthopedic Radiology, 2nd Edition. WB Saunders Co 1992.