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The accuracy of needle electrode placement by trainees in selected forearm muscles using verification by
Tae Gun Jin1, Dominic D'Andrea2, Senda Ajroud-Driss3
1Regenerative Neurorehabilitation Laboratory, Shirley Ryan Ability Lab (Formerly the Rehabilitation Institute of Chicago), Chicago, IL, United States.
Introduction:
Anatomic landmarks alone may not always be sufficient to accurately guide electromyography (EMG) electrode needle placement.
Methods:
Senior residents and fellows (n = 11) targeted 4 forearm muscles with anatomic landmarks alone versus with audiovisual EMG feedback. Accuracy of EMG needle placement was verified using neuromuscular ultrasound imaging.
Results:
While relatively large and superficial FCR muscle was sampled at a rate of 100% with and without audiovisual EMG feedback, accuracy of deeper and/or smaller forearm muscles (FPL, EIP, and SUP) diminished significantly without audiovisual EMG feedback.
Discussion:
Our study suggests that in clinical scenarios in which an electrodiagnostician relies on anatomic landmarks alone to target small and deep muscles, the risk of misplacement of needle electrode is increased. Consideration for neuromuscular ultrasound to augment training and/or real time guidance in EMG practice may be appropriate.
