In vitro simulation : Early results of stereotaxy for pedicle screw placement

Frameless stereotaxy with doppler ultrasound and three dimensional computer model registration is assessed in vitro for pedicle screw placement. To identify feasibility of pedicle screw navigation and placement using this technology. Inaccurate pedicle screw placement can lead to neurovascular injur...

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Bibliographic Details
Published in:Spine (Philadelphia, Pa. 1976) Pa. 1976), 1997-05, Vol.22 (10), p.1160-1164
Main Authors: CARL, A. L, KHANUJA, H. S, SACHS, B. L, GATTO, C. A, VOMLEHN, J, VOSBURGH, K, SCHENCK, J, LORENSEN, W, ROHLING, K, DISLER, D
Format: Article
Language:English
Subjects:
Biological and medical sciences
Bone Screws
Cadaver
Computer Simulation
Feasibility Studies
Humans
Image Processing, Computer-Assisted
Lumbar Vertebrae - surgery
Medical sciences
Orthopedic surgery
Sacrum - surgery
Stereotaxic Techniques
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Tomography, X-Ray Computed
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Summary:Frameless stereotaxy with doppler ultrasound and three dimensional computer model registration is assessed in vitro for pedicle screw placement. To identify feasibility of pedicle screw navigation and placement using this technology. Inaccurate pedicle screw placement can lead to neurovascular injury or suboptimal fixation. Present techniques in pedicle screw placement involve only confirmation of hole orientation. Forty-four pedicle screws were placed in lumbosacral models and cadaver specimens. Accuracy was assessed with a computed tomography scan and vertebral cross sectioning. All screws were intrapedicular. Accuracy of anterior cortical fixation was 1.5 mm, with a range of 2.5 mm. In vitro frameless stereotaxy is accurate for pedicle screw placement. This technology adds a component of navigation to pedicle screw placement.
ISSN:0362-2436
1528-1159
DOI:10.1097/00007632-199705150-00018