"Tripod Sign" or "Amoss′s Sign" is a sign of meningeal
irritation. Although useful in diagnosing meningitis, it is not
pathognomic and may be seen in a variety of clinical conditions.
Infants < 1 year of age and immunocompromised individuals may not
demonstrate signs of meningeal irritation. Since elicitation of the
sign requires voluntary sitting up, it is of limited use in patients
with marked altered sensorium and young infants
