Pedicle and spinal canal parameters of the lower thoracic and lumbar vertebrae in the achondroplast population

Uma Srikumaran, Eboni J. Woodard, Arabella I. Leet, Daniele Rigamonti, Paul David Sponseller, Michael Ain

Research output: Contribution to journalArticle

Abstract

STUDY DESIGN. Retrospective morphometric population study. OBJECTIVE. To characterize pedicle and spinal canal morphology of the achondroplastic lower thoracic and lumbar vertebrae and to suggest dimensions for improving pedicle screw selection and placement. SUMMARY OF BACKGROUND DATA. Although morphometric population studies exist for various races, to our knowledge, no such analysis has been made in achondroplastic patients. METHODS. With computer software, we measured pedicle parameters on the computed tomography images of 19 adult achondroplastic patients. RESULTS. Pedicle and chord lengths ranged from 9.5-12.5 mm and 29.5-36.4 mm, respectively. Transverse pedicle diameter increased from T9 (5.5 mm) to L5 (14.2 mm). Sagittal pedicle diameter declined from L1 (11.6 mm) to L5 (7.8 mm). Transverse angulation was greatest at L5 (15.7°) and smallest at T12 (1.1°). Pedicles were directed cranially at all levels, ranging from 3.8°-15.6°. Interpedicular distance and cross-sectional area were smallest at L4 (14.9 mm and 119 mm, respectively). Pedicle starting points diverged from T9 (13.6 mm) to L5 (19.2 mm). CONCLUSION. Achondroplastic pedicle morphology differs markedly from those of the normal spine: chord lengths are substantially shorter, pedicles are inclined cranially, pedicle starting points diverge progressively in the lumbar spine, and pedicle shape transitions from vertically to horizontally oriented ellipsoids along the lumbar spine. Consideration of this variation could maximize the effectiveness and safety of pedicle instrumentation.

Original languageEnglish (US)
Pages (from-to)2423-2431
Number of pages9
JournalSpine
Volume32
Issue number22
DOIs
StatePublished - Oct 2007

Fingerprint

Thoracic Vertebrae
Lumbar Vertebrae
Spinal Canal
Spine
Population
Software
Tomography
Safety

Keywords

  • Achondroplasia
  • Dysplasia
  • Pedicle
  • Spinal deformity
  • Thoracolumbar spine

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Orthopedics and Sports Medicine

Cite this

Pedicle and spinal canal parameters of the lower thoracic and lumbar vertebrae in the achondroplast population. / Srikumaran, Uma; Woodard, Eboni J.; Leet, Arabella I.; Rigamonti, Daniele; Sponseller, Paul David; Ain, Michael.

In: Spine, Vol. 32, No. 22, 10.2007, p. 2423-2431.

Research output: Contribution to journalArticle

@article{86f0b95ff036499895d96477721022b2,
title = "Pedicle and spinal canal parameters of the lower thoracic and lumbar vertebrae in the achondroplast population",
abstract = "STUDY DESIGN. Retrospective morphometric population study. OBJECTIVE. To characterize pedicle and spinal canal morphology of the achondroplastic lower thoracic and lumbar vertebrae and to suggest dimensions for improving pedicle screw selection and placement. SUMMARY OF BACKGROUND DATA. Although morphometric population studies exist for various races, to our knowledge, no such analysis has been made in achondroplastic patients. METHODS. With computer software, we measured pedicle parameters on the computed tomography images of 19 adult achondroplastic patients. RESULTS. Pedicle and chord lengths ranged from 9.5-12.5 mm and 29.5-36.4 mm, respectively. Transverse pedicle diameter increased from T9 (5.5 mm) to L5 (14.2 mm). Sagittal pedicle diameter declined from L1 (11.6 mm) to L5 (7.8 mm). Transverse angulation was greatest at L5 (15.7°) and smallest at T12 (1.1°). Pedicles were directed cranially at all levels, ranging from 3.8°-15.6°. Interpedicular distance and cross-sectional area were smallest at L4 (14.9 mm and 119 mm, respectively). Pedicle starting points diverged from T9 (13.6 mm) to L5 (19.2 mm). CONCLUSION. Achondroplastic pedicle morphology differs markedly from those of the normal spine: chord lengths are substantially shorter, pedicles are inclined cranially, pedicle starting points diverge progressively in the lumbar spine, and pedicle shape transitions from vertically to horizontally oriented ellipsoids along the lumbar spine. Consideration of this variation could maximize the effectiveness and safety of pedicle instrumentation.",
keywords = "Achondroplasia, Dysplasia, Pedicle, Spinal deformity, Thoracolumbar spine",
author = "Uma Srikumaran and Woodard, {Eboni J.} and Leet, {Arabella I.} and Daniele Rigamonti and Sponseller, {Paul David} and Michael Ain",
year = "2007",
month = "10",
doi = "10.1097/BRS.0b013e3181574286",
language = "English (US)",
volume = "32",
pages = "2423--2431",
journal = "Spine",
issn = "0362-2436",
publisher = "Lippincott Williams and Wilkins",
number = "22",

}

TY - JOUR

T1 - Pedicle and spinal canal parameters of the lower thoracic and lumbar vertebrae in the achondroplast population

AU - Srikumaran, Uma

AU - Woodard, Eboni J.

AU - Leet, Arabella I.

AU - Rigamonti, Daniele

AU - Sponseller, Paul David

AU - Ain, Michael

PY - 2007/10

Y1 - 2007/10

N2 - STUDY DESIGN. Retrospective morphometric population study. OBJECTIVE. To characterize pedicle and spinal canal morphology of the achondroplastic lower thoracic and lumbar vertebrae and to suggest dimensions for improving pedicle screw selection and placement. SUMMARY OF BACKGROUND DATA. Although morphometric population studies exist for various races, to our knowledge, no such analysis has been made in achondroplastic patients. METHODS. With computer software, we measured pedicle parameters on the computed tomography images of 19 adult achondroplastic patients. RESULTS. Pedicle and chord lengths ranged from 9.5-12.5 mm and 29.5-36.4 mm, respectively. Transverse pedicle diameter increased from T9 (5.5 mm) to L5 (14.2 mm). Sagittal pedicle diameter declined from L1 (11.6 mm) to L5 (7.8 mm). Transverse angulation was greatest at L5 (15.7°) and smallest at T12 (1.1°). Pedicles were directed cranially at all levels, ranging from 3.8°-15.6°. Interpedicular distance and cross-sectional area were smallest at L4 (14.9 mm and 119 mm, respectively). Pedicle starting points diverged from T9 (13.6 mm) to L5 (19.2 mm). CONCLUSION. Achondroplastic pedicle morphology differs markedly from those of the normal spine: chord lengths are substantially shorter, pedicles are inclined cranially, pedicle starting points diverge progressively in the lumbar spine, and pedicle shape transitions from vertically to horizontally oriented ellipsoids along the lumbar spine. Consideration of this variation could maximize the effectiveness and safety of pedicle instrumentation.

AB - STUDY DESIGN. Retrospective morphometric population study. OBJECTIVE. To characterize pedicle and spinal canal morphology of the achondroplastic lower thoracic and lumbar vertebrae and to suggest dimensions for improving pedicle screw selection and placement. SUMMARY OF BACKGROUND DATA. Although morphometric population studies exist for various races, to our knowledge, no such analysis has been made in achondroplastic patients. METHODS. With computer software, we measured pedicle parameters on the computed tomography images of 19 adult achondroplastic patients. RESULTS. Pedicle and chord lengths ranged from 9.5-12.5 mm and 29.5-36.4 mm, respectively. Transverse pedicle diameter increased from T9 (5.5 mm) to L5 (14.2 mm). Sagittal pedicle diameter declined from L1 (11.6 mm) to L5 (7.8 mm). Transverse angulation was greatest at L5 (15.7°) and smallest at T12 (1.1°). Pedicles were directed cranially at all levels, ranging from 3.8°-15.6°. Interpedicular distance and cross-sectional area were smallest at L4 (14.9 mm and 119 mm, respectively). Pedicle starting points diverged from T9 (13.6 mm) to L5 (19.2 mm). CONCLUSION. Achondroplastic pedicle morphology differs markedly from those of the normal spine: chord lengths are substantially shorter, pedicles are inclined cranially, pedicle starting points diverge progressively in the lumbar spine, and pedicle shape transitions from vertically to horizontally oriented ellipsoids along the lumbar spine. Consideration of this variation could maximize the effectiveness and safety of pedicle instrumentation.

KW - Achondroplasia

KW - Dysplasia

KW - Pedicle

KW - Spinal deformity

KW - Thoracolumbar spine

UR - http://www.scopus.com/inward/record.url?scp=37349118005&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=37349118005&partnerID=8YFLogxK

U2 - 10.1097/BRS.0b013e3181574286

DO - 10.1097/BRS.0b013e3181574286

M3 - Article

VL - 32

SP - 2423

EP - 2431

JO - Spine

JF - Spine

SN - 0362-2436

IS - 22

ER -