| Variation of the position of the aorta relative to a kyphotic thoracic spine: Safety margin for pedicle screw placement in the adult Japanese population. | |
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MedLine Citation:
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PMID: 21508888 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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ABSTRACT: Study Design: An analysis of computed tomography images of the spine in adult Japanese patients.Objective: To evaluate the variation of the position of the aorta relative to a spine with a thoracic kyphotic angle and to verify the safety margin for transpedicular screw fixation.Summary of Background Data: Recent studies have suggested that the aorta is positioned more laterally and posteriorly in patients with idiopathic scoliosis than in normal patients; however, variation of the position of the aorta in thoracic sagittal alignment has not been performed.Methods: T4-T12 vertebrae were studied using computer tomography images in 58 Japanese patients (age 31-90 years old) with normal coronal alignment of the spine. Pedicle diameter (PD), pedicle length (PL), chord length (CL), closest distance from the aorta (CD), and pedicle-aorta angle (PAA) were evaluated using a Mann-Whitney U test and Spearman rank correlation analysis.Results: PD showed an increase in size from T4 (4.7 mm) to T12 (8.2 mm), PL had an almost constant size of about 20 mm, and CL increased from T4 (37.7 mm) to T12 (47.2 mm). CD decreased from T4 (29.6 mm) to T6 (24.6 mm) and then increased to T12 (49.3 mm). PAA increased from T4 (31.5°) to T6 (38.6°) and then decreased to T12 (5.0°). Sagittal curvature showed a correlation with PAA, with an increasing sagittal thoracic Cobb angle related to decreases in PAA at the T5 (r = -0.31, p = 0.034), T6 (r = -0.37, p = 0.008) and T7 (r = -0.29, p = 0.036) levels.Conclusion: The descending aorta is positioned more medially at the T5, T6 and T7 levels in patients with a kyphotic spine. These spatial relationships should be considered when planning pedicle screw insertion for a kyphotic spine. |
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Authors:
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Masayuki Ohashi; Takui Ito; Toru Hirano; Naoto Endo |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-19 |
Journal Detail:
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Title: Spine Volume: - ISSN: 1528-1159 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7610646 Medline TA: Spine (Phila Pa 1976) Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Division of Orthopaedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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