. . . "knee-jerk reflex"@en-us . . "0"^^ . . . "00864859-n"^^ . . "100813191"@en-us . . "100557242"@en-us . "patellar reflex"@en-us . "knee jerk"^^ . "0"^^ . . . . . "a reflex extension of the leg resulting from a sharp tap on the patellar tendon"@en-us . "100864859"^^ . "knee jerk"@en-us .