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Wartenberg s sign:Explained

Method of elicitation
The patient supinates his slightly flexed fingers, with the thumb in abduction
The examiner pronates his hand and links his fingers with that of the patient's fingers.
Then pull fingers against each other's  resistance(i.e hooking the fingers of the examiner and the patient. then flex their fingers against each other's resistance)
Normally, the thumb extends, though the terminal  phalanx may flex slightly.
In the presence of pyramidal lesion the thumb adducts and flexes strongly.

Clinical significance
It indicates pyramidal tract lesion and may be taken as an equivalent of Babinski sign in case of
of both lower limbs are absent