Chaddock reflex

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Chaddock reflex is a neurological sign used to assess the integrity of the corticospinal tract. It is named after the American neurologist Charles Gilbert Chaddock. The reflex is considered a variant of the Babinski sign, which is another diagnostic tool used to evaluate the same neural pathways.

Elicitation

The Chaddock reflex is elicited by stimulating the skin around the lateral malleolus (the bony prominence on the outer side of the ankle). The examiner uses a blunt instrument to stroke the skin in a circular motion around the lateral malleolus. A positive Chaddock reflex is indicated by an extension of the big toe, often accompanied by fanning of the other toes. This response is similar to the one observed in the Babinski sign.

Clinical Significance

A positive Chaddock reflex is indicative of an upper motor neuron lesion affecting the corticospinal tract. This reflex is particularly useful in patients where the Babinski sign is difficult to elicit or is equivocal. It is often used in conjunction with other reflex tests, such as the Oppenheim reflex and the Gordon reflex, to provide a comprehensive assessment of neurological function.

History

The Chaddock reflex was first described by Charles Gilbert Chaddock in the early 20th century. Chaddock was a prominent neurologist who contributed significantly to the field of neurology, particularly in the study of reflexes and their clinical implications.

Related Reflexes

• Babinski sign
• Oppenheim reflex
• Gordon reflex
• Hoffmann's reflex

See Also

• Neurology
• Corticospinal tract
• Upper motor neuron lesion
• Reflexes