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World Neurosurg. 2017 Nov;107:322-333. doi: 10.1016/j.wneu.2017.07.167. Epub 2017 Aug 7.

Can Fan-Beam Interactive Computed Tomography Accurately Predict Indirect Decompression in Minimally Invasive Spine Surgery Fusion Procedures?

Author information

1
Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA; Department of Neurosurgery, Klinikum rechts der Isar, Munich, Germany.
2
Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA; Department of Orthopedic and Trauma Surgery, University Medical Center Freiburg, Freiburg, Germany.
3
Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA.
4
Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA; Department of Orthopedic and Trauma Surgery, Infanta Elena Hospital, Madrid, Spain.
5
Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA. Electronic address: roger@hartlmd.net.

Abstract

BACKGROUND:

Recently, novel mobile intraoperative fan-beam computed tomography (CT) was introduced, allowing for real-time navigation and immediate intraoperative evaluation of neural decompression in spine surgery. This study sought to investigate whether intraoperatively assessed neural decompression during minimally invasive spine surgery (MISS) has a predictive value for clinical and radiographic outcome.

METHODS:

A retrospective study of patients undergoing intraoperative CT (iCT)-guided extreme lateral interbody fusion or transforaminal lumbar interbody fusion was conducted. 1) Preoperative, 2) intraoperative (after cage implantation, 3) postoperative, and 4) follow-up radiographic and clinical parameters obtained from radiography or CT were quantified.

RESULTS:

Thirty-four patients (41 spinal segments) were analyzed. iCT-based navigation was successfully accomplished in all patients. Radiographic parameters showed significant improvement from preoperatively to intraoperatively after cage implantation in both MISS procedures (extreme lateral interbody fusion/transforaminal lumbar interbody fusion) (P ≤ 0.05). Radiologic parameters for both MISS fusion procedures did not show significant differences to the assessed radiographic measures at follow-up (P > 0.05). Radiologic outcome values did not decrease when compared intraoperatively (after cage implantation) to latest follow-up.

CONCLUSIONS:

Intraoperative fan-beam CT is capable of assessing neural decompression intraoperatively with high accuracy, allowing for precise prediction of radiologic outcome and earliest possible feedback during MISS fusion procedures. These findings are highly valuable for routine practice and future investigations toward finding a threshold for neural decompression that translates into clinical improvement. If sufficient neural decompression has been confirmed with iCT imaging studies, additional postoperative and/or follow-up imaging studies might no longer be required if patients remain asymptomatic.

KEYWORDS:

CT; Degeneration; Fusion; Navigation; Spine; TLIF; XLIF

PMID:
28797980
DOI:
10.1016/j.wneu.2017.07.167
[Indexed for MEDLINE]

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