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Journal of Bone and Joint Surgery, 1966;48:1377-1382.
© 1966 by The Journal of Bone and Joint Surgery, Inc

Direct Electromyography of the Psoas Major Muscle in Man

ROBERT D. KEAGY M.D.1, JOEL BRUMLIK M.D.1, and JOHN J. BERGAN M.D.1

1 From the Departments of Orthopaedic Surgery, Neurology and Psychiatry, and Surgery, Northwestern University Medical School, Chicago

Electromyographic studies of the psoas major muscle were performed on five patients with wire electrodes implanted directly into the muscle during lumbar sympathectomy. Recordings made during various activities, approximately ten days after operation, indicated that this muscle has a regular and significant role in advancing the limb while walking and in controlling deviation of the trunk during sitting. The action of the psoas in rotation, abduction, and adduction of the hip was slight and somewhat variable, suggesting a stabilizing function.


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