Analysis of Biomechanical Changes After Removal of Instrumentation in Lumbar Arthrodesis by Finite Element Analysis

Overview

Journal Med Biol Eng Comput

Publisher Springer

Specialties Biomedical Engineering
Medical Informatics

Date 2010 May 5

PMID 20440570

Citations 28

Authors

Ho-Joong Kim

Heoung-Jae Chun

Seong-Hwan Moon

Kyoung-Tak Kang

Hak-Sun Kim

Jin-Oh Park

Eun-Su Moon

Joon-Seok Sohn

Hwan-Mo Lee

Affiliations

Soon will be listed here.

Abstract

The purpose of this study is to investigate the change in biomechanical milieu following removal of pedicle screws in instrumented single level lumbar arthrodesis. Using a validated finite element (FE) model of the intact lumbar spine (L2-5), two scenarios of L3-4 lumbar fusion were simulated: posterolateral fusion (PLF) at L3-4 using pedicle screws (PLF with pedicle screws; WiP) and L3-4 lumbar posterolateral fusion state after removal of pedicle screws (PLF without pedicle screws; WoP). The WiP model had greater range of motion (ROM) at each adjacent segment than the WoP model. This phenomenon became pronounced at the proximal adjacent segment under flexion moment. Similarly, removal of pedicle screws (the WoP model) relieved the maximal von Mises stress at adjacent segments under 4 moments compared to the WiP model. This study demonstrated that removal of pedicle screws could decrease stiffness of fusion segments, which would reduce the disk stress of adjacent segments.

Citing Articles

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