It is especially important to test for ankle clonus if:
a. deep tendon reflexes are hyperactive.
b. deep tendon reflexes are hypoactive.
c. the Romberg sign is positive.
d. the patient has peripheral neuropathy.
A
Test the ankle clonus when reflexes are hyperactive. Support the patient's knee in a flexed posi-tion and briskly dorsiflex the foot with your other hand. If clonus is present, there is recurrent ankle plantar flexion movement as long as the examiner retains the foot in dorsiflexion. Sustained clonus signifies the hypertonia of an upper motor neuron lesion.
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