Clonus of the Brachioradialis Reflex as a Sign of Cervical Myelopathy
Posted on May 2, 2023 Neurology Blog Editor A 59-year-old man presented with progressive right arm weakness and gait instability. Neurologic examination revealed clonus of the right brachioradialis (Video 1). Clonus is elicited in the same manner as eliciting a muscle stretch reflex, and is a sign of hyperreflexia, suggesting an upper motor neuron lesion.