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Intraoperative Monitoring with Stimulus-Evoked Electromyography during Placement of Iliosacral Screws. An Initial Clinical Study*
BERTON R. MOED, M.D.†; B. K. AHMAD, M.D.‡; JOSEPH G. CRAIG, M.D.‡; GARY P. JACOBSON, PH.D.‡; MARK J. ANDERS, M.D.§, DETROIT, MICHIGAN
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Investigation performed at the Division of Orthopaedic Traumatology, Department of Orthopaedic Surgery, Henry Ford Hospital, Detroit
J Bone Joint Surg Am, 1998 Apr 01;80(4):537-46
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Abstract

A consecutive series of twenty-seven patients who had thirty acute unstable (type-C) fractures of the pelvic ring was studied prospectively to evaluate the use of stimulus-evoked electromyography to decrease the risk of iatrogenic nerve-root injury during the insertion of iliosacral screws. A prerequisite for inclusion in the study was a normal neurological status preoperatively; somatosensory evoked potentials were monitored to further document the neurological status both before and after insertion of the screw or screws. A total of fifty-one iliosacral screws were inserted, and a current threshold of more than eight milliamperes was selected as the level that indicated that the drill-bit was a safe distance from the nerve root. Four of the fifty-one screws were redirected because of information obtained with stimulus-evoked electromyography.Postoperatively, all patients had a normal neurological status. Computerized tomography, although not accurate for detailed measurements, demonstrated that all of the screws were in a safe, intraosseous position. Monitoring with stimulus-evoked electromyography appears to provide reliable data and may decrease the risk of iatrogenic injury to the nerve roots during operations on the pelvic ring.

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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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