Fig. 2

Intraoperative electromyography recordings displaying patient spasms. Baseline intraoperative free-run EMG activity before muscle spasms displaying no muscle activity (a), and EMG burst activity during intraoperative leg muscle spasms (b). The activity during the muscle spasms is most pronounced in the quadriceps, although all EMGs showed substantial activity at this time. EMG electromyography, QUAD vastus medialis, TA tibialis anterior, AH abductor halluces