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Denervation for the treatment of acquired spasticity of the brachioradialis.

Spasticity of the brachioradialis developed in three adolescent boys after an episode of intracranial bleeding. The spasticity resulted in paradoxical contraction of the muscle during attempted active extension of the elbow. The flexed posture of the elbow was both dysfunctional and embarrassing to the patient. A block of the radial nerve with lidocaine at the mid-humeral level confirmed the diagnosis of paradoxical spasticity. After denervation of the brachioradialis, the ability to extend the elbow markedly improved, and the improvement was maintained at the time of follow-up which ranged from two to five years.