V sign of interphalangeal joint dislocation

Last revised by Dr Yair Glick on 13 Apr 2022

The V sign is characterized on a lateral radiograph of the digit by the separation of the dorsal base of the dislocated phalanx and the head of the phalanx proximal to the incongruent joint 1,2.

Before reduction, the V sign might be assessed to identify more subtle dorsal subluxations 1.

If the V sign is present after reduction, it indicates joint instability which may require operative treatment 2.

See also

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