Strümpell's sign is a

clinical sign Signs and symptoms are the observed or detectable signs, and experienced symptoms of an illness, injury, or condition. A sign for example may be a higher or lower temperature than normal, raised or lowered blood pressure or an abnormality showin ...

in which the patient's attempt to

flex Flex or FLEX may refer to: Computing * Flex (language), developed by Alan Kay * FLEX (operating system), a single-tasking operating system for the Motorola 6800 * FlexOS, an operating system developed by Digital Research * FLEX (protocol), a comm ...

the knee against resistance elicits an extensor plantar reflex. It is found in patients with pyramidal tract lesions, and is one of a number of Babinski-like responses. The sign is named after

Adolf Strümpell Ernst Adolf Gustav Gottfried Strümpell, from 1893 von Strümpell (29 June 1853 – 10 January 1925), was a Baltic German neurology, neurologist. Life Strümpell was born in Neu-Autz, Courland (the present Jaunauce parish, Jaunauce, Latvia), t ...

References

Symptoms and signs: Nervous system Reflexes {{med-sign-stub