A 39-year-old woman diagnosed as having Hashimoto thyroiditis 1 month prior developed spasms in her axial and lower limb muscles and diffuse hypertonia and rigidity in all extremities, illustrated by patellar clonus in response to deep tendon reflex testing in this video. She had elevated levels ...
Clonusis tested by forcibly dorsiflexing the foot at the ankle and observing for rebounding of the foot. As with deep tendon reflexes, clonus tests for upper motor neuron disease, documented by the number of repetitions or beats. View article ...