Scaphoid non-union advanced collapse (SNAC)

Case contributed by Carlos Ignacio Canet
Diagnosis certain

Presentation

Wrist pain with a remote history of trauma.

Patient Data

Age: 60 years
Gender: Male

Non-united fracture at the junction of the middle and proximal third of the scaphoid bone, forming a pseudoarthrosis.

There is dorsal inclination of the lunate (DISI).

Degenerative changes in radio-scaphoid, radio-lunate, scaphocapitate with progression to the lunocapitate joints.

CT confirms the findings visible on MRI, with non-united fracture of the scaphoid, with collapse of the proximal pole, and advanced degenerative changes in radio-scaphoid-lunate and intercarpal joints.

Case Discussion

This case demonstrates:

  • Non-united fracture of the scaphoid with pseudoarthrosis.

  • Advanced degenerative changes compatible with scaphoid non-union advance collapse (SNAC) - stage 3.

  • Dorsal inclination of the lunate (DISI).

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