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REPRODUCIBILITY OF S2-ALAR ILIAC SCREW MORPHOMETRIC ANALYSIS
Mariana Demétrio DE Sousa Pontes1, Lucas Américo Francisco1, Lucas Klarosk Ismael1
1Universidade de São Paulo, Ribeirão Preto School of Medicine, Department of Orthopedics and Anesthesiology, Ribeirão Preto, SP, Brazil.
Acta Ortopedica Brasileira
|July 12, 2021
Summary
This study assessed the reliability of measuring S2-alar iliac (S2AI) screw parameters. Results show moderate to excellent inter- and intraobserver reliability for most measurements, indicating a dependable method.
Area of Science:
- Spinal surgery
- Orthopedic biomechanics
- Radiographic analysis
Background:
- Accurate measurement of S2-alar iliac (S2AI) screw parameters is crucial for successful spinal fusion.
- Assessing the reproducibility of these measurements is essential for clinical application and research.
Purpose of the Study:
- To evaluate the inter- and intraobserver reliability of a morphometric measurement method for S2AI screw parameters.
- To determine the consistency of measurements for screw length, diameter, and trajectory angles.
Main Methods:
- Cross-sectional study utilizing computed tomography (CT) exams.
- Morphometric analysis performed via multiplanar reconstructions.
- Intraclass correlation coefficient (ICC) used to assess measurement reproducibility.
Main Results:
- Strong interobserver reliability for shortest screw length (ICC: 0.742) and diameter (ICC: 0.699).
- Moderate interobserver reliability for longest screw length and axial trajectory angles.
- Excellent intraobserver reliability for all screw length and diameter measurements, and axial trajectory angles.
Conclusions:
- The S2AI screw morphometric parameter measurement method demonstrates moderate to excellent inter- and intraobserver reliability for most variables.
- Screw trajectory angle in the sagittal plane showed weak interobserver reliability and was not statistically significant.
- The method is reliable for clinical and research applications, with potential limitations in sagittal plane angle measurements.
