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The ankle jerk reflex, also known as the Achilles reflex, occurs when the Achilles tendon is tapped while the foot is dorsi-flexed. A positive result would be the jerking of the foot towards its plantar surface.
The achilles reflex checks if the s1 and s2 nerve roots are intact and could be indicative of sciatic nerve pathology. It is clasically delayed in hypothyroidism.
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