Mega os trigonum in progressive pseudorheumatoid dysplasia
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1Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA. oestreich.ae@chmcc.org
Background:
Progressive pseudorheumatoid dysplasia (PPRD), a noninflammatory condition, needs to be differentiated diagnostically from juvenile rheumatoid arthritis (JRA).
Objective:
Demonstration of an unusually large and often early-appearing os trigonum helps distinguish PPRD from JRA.
Materials And Methods:
Ankle images in four children with PPRD were reviewed.
Results:
The os trigonum was abnormally enlarged in all PPRD subjects and was shown to have appeared or fused earlier than normal in two subjects.
Conclusion:
A large and early os trigonum ossification helps differentiate PPRD from JRA.
