The daily education pearl – carpal ligamentous injuries

Carpal ligamentous injuries

With thanks to Yusuf.

Fall on outstretched hand (FOOSH) can cause several carpal ligamentous injuries. These occur in 4 sequential stages, beginning with scapholunate joint dislocation and proceeding around the lunate causing progressive carpal instability.

 

Stage I – scapholunate dislocation – widening of scapholunate joint (the “Terry Thomas” or “Madonna” sign)

Stage II – perilunate dislocation (capitate is posteriorly dislocated but the lunate remains articulated with the radius); look for associated scaphoid and ulnar styloid fractures

Stage III – stage II injury + dislocated triquetrum; can be associated with a volar triquetral fracture

Stage IV – lunate dislocation (from both radius and capitate)

All need early reduction and Orthopaedics referral.

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