Ankle jerk reflex 380299 221552465 2008-06-25T00:47:01Z 71.176.116.251 The '''ankle jerk reflex''', also known as the '''Achilles reflex''', occurs when the [[Achilles tendon]] is tapped while the foot is [[dorsiflexion|dorsi-flexed]]. A positive result would be the jerking of the foot towards its plantar surface. The Achilles [[Reflex action|reflex]] checks if the S1 and S2 [[nerve]] roots are intact and could be indicative of [[sciatic nerve]] [[pathology]]. It is classically delayed in [[hypothyroidism]]. This reflex is usually absent in [[herniated disk|disk herniations]] at the L5-S1 level. == See also == *[[Tonic vibration reflex]] {{med-sign-stub}} {{Reflex}} [[Category:Reflexes]] [[de:Achillessehnenreflex]] [[nl:Achillespeesreflex]]