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Figure 4: (A) Preoperative surface electromyography (EMG) trace during active pronation (1–5) and supination (a-e) in a patient with cervical compressive myelopathy. The frequency of contraction is approximately 1 contraction/second. Note the co-contraction of the pronators during supination (arrows), (B) postoperative surface EMG trace during active pronation and supination in the same patient a week after surgery. Note the increased frequency of contraction as well as the almost complete absence of co-contraction in the pronators during supination that corresponded with a subjective improvement in spasticity

Figure 4:  (A) Preoperative surface electromyography (EMG) trace during active pronation (1–5) and supination (a-e) in a patient with cervical compressive myelopathy. The frequency of contraction is approximately 1 contraction/second. Note the co-contraction of the pronators during supination (arrows), (B) postoperative surface EMG trace during active pronation and supination in the same patient a week after surgery. Note the increased frequency of contraction as well as the almost complete absence of co-contraction in the pronators during supination that corresponded with a subjective improvement in spasticity