Kernig Sign (Meningitis) Assessment with Memory Trick Nursing

Recognizing Kernig sign is an important part of the neurological assessment when meningitis is suspected. This sign helps identify meningeal irritation, which occurs when the meninges (the protective membranes surrounding the brain and spinal cord) become inflamed.

How to Assess Kernig Sign

1. Position the patient:
   -Have the patient lie supine (flat on their back).

2. Flex the hip and knee:
-Gently flex the patient’s hip and knee to a 90° angle.

3. Extend the knee:
-While keeping the hip flexed, extend the knee.

4. Observe for response:

• A positive Kernig sign occurs if the patient experiences pain or resistance during knee extension.
• This discomfort happens because stretching the leg in this position pulls on the inflamed meninges.

Demonstration on Kernig’s Sign

What a Positive Kernig Sign Indicates

A positive Kernig sign suggests meningeal irritation, commonly seen in:

• Bacterial or viral meningitis
• Subarachnoid hemorrhage (less commonly)

This sign is often assessed alongside Brudzinski sign, which also indicates meningeal irritation.

The Pathophysiology Behind Kernig

In meningitis, inflammation of the meninges causes increased sensitivity and stiffness in the spinal and neural tissues. When the leg is extended while the hip remains flexed, the nerve roots and meninges stretch, triggering pain or muscle resistance as a protective response.

Memory Trick for Nursing Students

Kernig = K + E → Knee Extension

Remember that pain with knee extension equals a positive Kernig sign. This quick mnemonic helps recall both the action and the meaning during exams or clinical practice.

Key Points to Remember

• Patient position: Supine
• Action: Flex hip and knee to 90°, then extend knee
• Positive sign: Pain or resistance
• Indicates: Meningeal irritation (meningitis)
• Mnemonic: K = Knee, E = Extension

You may be interested in: Meningitis Nursing Review or Brudzinski Sign

_References:

_{A.D.A.M., Inc. (2024, November 10). Kernig’s sign of meningitis. MedlinePlus. U.S. National Library of Medicine. https://medlineplus.gov/ency/imagepages/19077.htm}

_{Centers for Disease Control and Prevention. (2025, September 9). About bacterial meningitis. Centers for Disease Control and Prevention. https://www.cdc.gov/meningitis/about/bacterial-meningitis.html}

_{Centers for Disease Control and Prevention. (2025, September 9). About viral meningitis. https://www.cdc.gov/meningitis/about/viral-meningitis.html}