Which sign is most specifically associated with meningeal irritation in adults?

Which sign is most specifically associated with meningeal irritation in adults?

• A. Kernig's sign
• B. Brudzinski's sign
• C. Nuchal rigidity sign
• D. Babinski sign

Answer: (B)

Brudzinski's sign is the most specific indicator of meningeal irritation in adults. When you passively flex the neck, the hips and knees reflexively bend. This linked movement happens because irritation of the meninges heightens the spinal reflexes in response to neck flexion, signaling meningeal inflammation such as meningitis. Nuchal rigidity simply means neck stiffness and can occur with various conditions, not all of which involve meninges. Kernig’s sign also points to meningeal irritation but can be less consistently elicited. Babinski sign reflects corticospinal tract involvement rather than meningeal irritation. So the distinctive, reflexive hip and knee flexion with neck flexion makes Brudzinski’s sign the most specific for meningeal irritation.

Brudzinski's sign is the most specific indicator of meningeal irritation in adults. When you passively flex the neck, the hips and knees reflexively bend. This linked movement happens because irritation of the meninges heightens the spinal reflexes in response to neck flexion, signaling meningeal inflammation such as meningitis.

Nuchal rigidity simply means neck stiffness and can occur with various conditions, not all of which involve meninges. Kernig’s sign also points to meningeal irritation but can be less consistently elicited. Babinski sign reflects corticospinal tract involvement rather than meningeal irritation. So the distinctive, reflexive hip and knee flexion with neck flexion makes Brudzinski’s sign the most specific for meningeal irritation.