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knee-jerk reflex (medicine)


knee-jerk reflex -->
patellar reflex


A sudden contraction of the anterior muscles of the thigh, caused by a smart tap on the patellar tendon while the leg hangs loosely at a right angle with the thigh.

Synonym: knee jerk, knee phenomenon, knee reflex, knee-jerk reflex, patellar tendon reflex, quadriceps reflex.