Trömner’s Sign

Trömner’s Sign

Trömner’s sign is flexion of the thumb and index finger in response to tapping or flicking the volar surface of the distal phalanx of the middle finger, held partially flexed between the examiner’s finger and thumb. This is an alternative method to Hoffmann’s sign ("snapping" the distal phalanx) to elicit the finger flexor response. As in the latter, it is suggestive of a corticospinal tract (upper motor neurone) lesion above C5 or C6, especially if unilateral, although it may be observed in some normal individuals.

Cross References

Hoffmann’s sign; Upper motor neurone (UMN) syndrome