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Deformation of Member under Multiple Loadings

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...

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Related Experiment Video

Updated: Aug 20, 2025

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

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High-Demand Spinal Deformity With Multi-Rod Constructs and Porous Fusion/Fixation Implants: A Finite Element Study.

Matteo Panico^1,2, Ruchi D Chande³, Derek P Lindsey³

¹IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.

Global Spine Journal

|November 24, 2022

Summary

This summary is machine-generated.

Multi-rod constructs and sacropelvic fixation effectively stabilize L5 pedicle subtraction osteotomy (PSO) for sagittal imbalance. These high-demand constructs reduce implant stress and motion, lowering risks of rod breakage and improving joint stability.

Keywords:

L5 biomechanics finite element high-demand construct multi-rod pedicle subtraction osteotomy

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Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability

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Published on: July 25, 2025

Area of Science:

Spine biomechanics and surgical simulation.
Finite element analysis of spinal constructs.

Background:

Pedicle subtraction osteotomy (PSO) at L5 is a treatment for sagittal imbalance, particularly with L4-L5 kyphosis.
Optimal instrumentation for PSO at L5 remains under-investigated.

Purpose of the Study:

To simulate and evaluate various high-demand instrumentation strategies for L5 PSO.
To assess the impact of varying rod numbers and sacropelvic implants on construct stability.

Main Methods:

A finite element model of the T10-pelvis was developed.
Simulated posterior fixation with and without L5 PSO, with variations in rod numbers and sacropelvic implants.
Applied pure moments to simulate physiological loading conditions.

Main Results:

PSO increased motion and stress on posterior rods and S1 pedicle screws.
Three- and four-rod configurations effectively limited rod stresses, approaching those of non-osteotomy fixation.
Multiple sacropelvic implants reduced range of motion, especially at the sacroiliac joint (SIJ).

Conclusions:

Multi-rod constructs and sacropelvic fixation reduce maximal implant stresses and motion.
These strategies suggest a lower risk of rod breakage and enhanced joint stability for L5 PSO.
High-demand constructs are beneficial for correcting sagittal imbalance with L5 PSO.