Which type of nerve injury causes an inability to extend the thumb in a hitchhiker's sign?

1 answer:

7 0

The hitchhike sign represents the extension of the thumb and it is used to identify two different conditions: radial nerve or posterior interosseous nerve palsy and diastrophic dwarfism.
If there is radial nerve lesion then weakness of brachioradialis and finger flexion occurs. <span>If there is a posterior interosseous nerve lesion then weakness of finger extension occurs.</span>

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