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Research ArticleLumbar Spine

Radius of Curvature in Patient-Specific Short Rod Constructs Versus Standard Pre-Bent Rods

KATHERINE BRANCHE, RAHWA NETSANET, ANDRIY NOSHCHENKO, EVALINA BURGER, VIKAS PATEL, DAVID OU-YANG and CHRISTOPHER J. KLECK
International Journal of Spine Surgery December 2020, 14 (6) 944-948; DOI: https://doi.org/10.14444/7143
KATHERINE BRANCHE
Department of Orthopedics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
BS
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RAHWA NETSANET
Department of Orthopedics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
BS
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ANDRIY NOSHCHENKO
Department of Orthopedics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
PHD
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EVALINA BURGER
Department of Orthopedics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
MD
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VIKAS PATEL
Department of Orthopedics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
MD
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DAVID OU-YANG
Department of Orthopedics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
MD
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CHRISTOPHER J. KLECK
Department of Orthopedics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado
MD
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ABSTRACT

Background: Recent studies support the need for sagittal alignment restoration when performing lumbar degenerative spinal fusions. The development of patient-specific spine rods (PSSRs) may help maintain or improve sagittal alignment in these surgeries.

Methods: A retrospective review was conducted for patients who underwent posterior spinal surgeries involving 4 or less levels. The preplanned PSSR radii of curvature (ROC) was compared with standard prebent rods with a ROC of 125 mm. All surgeries were performed at a single institution by 3 surgeons from September 2016 through October 2018. Data were then compared using a 2-tailed paired t test. PSSR had either 1 or 2 definitive ROCs.

Results: For rods with 2 ROCs, the “cranial” curve was measured between the upper instrumented level and L4 or L5. The “caudal” curve was measured between L4 or L5 and the lower instrumented level. The PSSR with 1 ROC and the caudal portion of the rods with 2 ROCs were significantly smaller than the industry standard ROC.

Conclusions: PSSR demonstrate more acute ROC than industry standard rods. In PSRs, the most lordosis occurs between L4-S1 and flattens out at the thoracolumbar junction, mimicking the normal distribution of lumbar lordosis. PSSRs could help achieve or maintain sagittal alignment and prevent the sequela of flat back syndrome.

  • lumbar lordosis
  • malalignment
  • pelvic incidence
  • pelvic tilt
  • sagittal balance
  • degenerative

Footnotes

  • Disclosures and COI: Evalina Burger, David Ou-Yang, and Christopher J. Kleck receive consulting payments from Medicrea. The other authors received no funding for this study and report no conflicts of interest.

  • This manuscript is generously published free of charge by ISASS, the International Society for the Advancement of Spine Surgery. Copyright © 2020 ISASS
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International Journal of Spine Surgery
Vol. 14, Issue 6
1 Dec 2020
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Radius of Curvature in Patient-Specific Short Rod Constructs Versus Standard Pre-Bent Rods
KATHERINE BRANCHE, RAHWA NETSANET, ANDRIY NOSHCHENKO, EVALINA BURGER, VIKAS PATEL, DAVID OU-YANG, CHRISTOPHER J. KLECK
International Journal of Spine Surgery Dec 2020, 14 (6) 944-948; DOI: 10.14444/7143

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Radius of Curvature in Patient-Specific Short Rod Constructs Versus Standard Pre-Bent Rods
KATHERINE BRANCHE, RAHWA NETSANET, ANDRIY NOSHCHENKO, EVALINA BURGER, VIKAS PATEL, DAVID OU-YANG, CHRISTOPHER J. KLECK
International Journal of Spine Surgery Dec 2020, 14 (6) 944-948; DOI: 10.14444/7143
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Keywords

  • lumbar lordosis
  • malalignment
  • pelvic incidence
  • pelvic tilt
  • sagittal balance
  • degenerative

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