Chaddock reflex

Chaddock reflex is a clinical sign used in neurology to test the integrity of the nervous system. It is named after the British neurologist, Charles Gilbert Chaddock, who first described it in 1911.

Description

The Chaddock reflex is elicited by stroking the lateral malleolus (the bony prominence on the outside of the ankle) with a blunt instrument. The normal response is no movement. If the big toe extends upward and the other toes fan out, the test is positive, indicating damage to the pyramidal tract, a part of the central nervous system that controls voluntary movements.

Clinical significance

A positive Chaddock reflex is a sign of upper motor neuron disease, such as stroke, multiple sclerosis, or spinal cord injury. It is similar to the Babinski sign, but is less well-known and less commonly used in clinical practice. However, it can be useful in patients who are unable to tolerate the Babinski test due to ticklishness or other reasons.

See also

• Babinski sign
• Hoffmann's sign
• Upper motor neuron lesion
• Neurological examination

References

Chaddock reflex Resources
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