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Research ArticleOther and Special Categories

Sacral Dysmorphism and Lumbosacral Transitional Vertebrae (LSTV) Review

David M. Matson, Lauren M. MacCormick, Jonathan N. Sembrano and David W. Polly
International Journal of Spine Surgery February 2020, 14 (s1) S14-S19; DOI: https://doi.org/10.14444/6075
David M. Matson
Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota
MD
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Lauren M. MacCormick
Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota
MD
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Jonathan N. Sembrano
Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota
MD
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David W. Polly Jr
Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota
MD
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    Figure 1

    Castellvi–Chan classification system of lumbosacral transitional anatomy.

    Image reprinted with permission from Castellvi et al.8

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    Figure 2

    Castellvi–Chan type IIB lumbosacral transitional vertebra identified on pelvis outlet view radiograph.

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    Figure 3

    (A) Castellvi–Chan type IIIA and (B) Castellvi–Chan type IIIB lumbosacral transitional vertebra identified on pelvis outlet view radiographs.

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    Figure 4

    Mammillary bodies and abnormal sacral neural exit present in the uppermost sacral segment of a dysmorphic sacrum.

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    Figure 5

    Tongue-and-groove sacroiliac joint surface of sacral dysmorphism identified on CT scan.

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    Figure 6

    The dysmorphic first sacral segment did not allow for a transiliac, transsacral screw at this level, as was used at S2.

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International Journal of Spine Surgery: 14 (s1)
International Journal of Spine Surgery
Vol. 14, Issue s1
1 Feb 2020
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Sacral Dysmorphism and Lumbosacral Transitional Vertebrae (LSTV) Review
David M. Matson, Lauren M. MacCormick, Jonathan N. Sembrano, David W. Polly
International Journal of Spine Surgery Feb 2020, 14 (s1) S14-S19; DOI: 10.14444/6075

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Sacral Dysmorphism and Lumbosacral Transitional Vertebrae (LSTV) Review
David M. Matson, Lauren M. MacCormick, Jonathan N. Sembrano, David W. Polly
International Journal of Spine Surgery Feb 2020, 14 (s1) S14-S19; DOI: 10.14444/6075
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Keywords

  • lumbosacral transitional vertebrae
  • LSTV
  • sacral dysmorphism
  • transitional lumbosacral vertebrae
  • low back pain
  • Bertolotti syndrome
  • sacroiliac joint fusion

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