Chaddock’s Sign or Chaddock’s Reflex
Chaddock’s sign is similar to a Babinsky Sign, in which stimulation over the lateral malleolus causes the big toe of an adulto to reflexively point upwards, which indicates potential lessions to the pyramidal tract.
How does Chaddock’s sign differ from Babinski’s Sign?
Charles Gilbert Chaddock was originally an assistant medical officer to Joseph Babinski (the neurologist who first identified the Babinski sign). Chaddock later move to the US and published his version of the sign, which included stimulation over the lateral malleolus, instead of the base of the foot.
To learn more about the Babinski Sign, please refer to my Babinski Sign page.