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Related Experiment Video

Updated: Jun 22, 2026

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
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Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

Published on: November 8, 2024

Spinopelvic parameters in postfusion flatback deformity patients.

Oren N Gottfried1, Michael D Daubs, Alpesh A Patel

  • 1Department of Orthopaedics, 590 Wakara Way, University of Utah, Salt Lake City, UT 81408, USA. ogottfr1@jhmi.edu

The Spine Journal : Official Journal of the North American Spine Society
|June 2, 2009
PubMed
Summary

Patients with fixed sagittal imbalance after spinal fusion often have high pelvic incidence and low lumbar lordosis. Compensatory mechanisms include reduced thoracic kyphosis and increased pelvic tilt.

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Area of Science:

  • Spine surgery
  • Orthopedics
  • Biomechanical analysis

Background:

  • Fixed sagittal imbalance (FSI) can occur after spinal fusion due to loss of lumbar lordosis (LL).
  • Pelvic incidence (PI) is a critical anatomical parameter influencing LL and overall spinal alignment.

Purpose of the Study:

  • To characterize spinopelvic parameters in patients with postfusion FSI.
  • To test the hypothesis that high PI increases the risk of FSI after lumbar fusion due to loss of LL.

Main Methods:

  • Retrospective review of patient charts and spinal imaging.
  • Evaluation of spinopelvic parameters including PI, LL, pelvic tilt (PT), thoracic kyphosis (TK), and C7 plumb line in 15 patients with FSI.

Main Results:

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Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
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Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis

Published on: March 23, 2019

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Last Updated: Jun 22, 2026

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Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
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Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis

Published on: March 23, 2019

  • Patients with FSI exhibited elevated mean PI (66.7°) and PT (35.5°).
  • Reduced mean LL (11.8°) and TK (19.3°) were observed, with an elevated C7 plumb line (13.1 cm).
  • The study identified 15 patients (13 female, 2 male; mean age 63.3 years) with significant FSI post-fusion.

    • Conclusions:

    • Postfusion FSI is associated with elevated PI and inadequate LL.
    • Patients compensate for FSI through reduced TK and increased pelvic retroversion (PT).
    • Identifying and optimizing sagittal spinopelvic parameters is crucial during lumbar fusion procedures to maintain balance.