Analysis of biomechanical changes after removal of instrumentation in lumbar arthrodesis by finite element analysis

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

doi:10.1007/s11517-010-0621-2

Analysis of biomechanical changes after removal of instrumentation in lumbar arthrodesis by finite element analysis

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

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

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.

Original language	English
Pages (from-to)	703-709
Number of pages	7
Journal	Medical and Biological Engineering and Computing
Volume	48
Issue number	7
DOIs	https://doi.org/10.1007/s11517-010-0621-2
Publication status	Published - 2010 Jul

All Science Journal Classification (ASJC) codes

Biomedical Engineering
Computer Science Applications

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title = "Analysis of biomechanical changes after removal of instrumentation in lumbar arthrodesis by finite element analysis",

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.",

author = "Kim, {Ho Joong} and Chun, {Heoung Jae} and Moon, {Seong Hwan} and Kang, {Kyoung Tak} and Kim, {Hak Sun} and Park, {Jin Oh} and Moon, {Eun Su} and Sohn, {Joon Seok} and Lee, {Hwan Mo}",

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doi = "10.1007/s11517-010-0621-2",

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AU - Kim, Ho Joong

AU - Chun, Heoung Jae

AU - Moon, Seong Hwan

AU - Kang, Kyoung Tak

AU - Kim, Hak Sun

AU - Park, Jin Oh

AU - Moon, Eun Su

AU - Sohn, Joon Seok

AU - Lee, Hwan Mo

PY - 2010/7

Y1 - 2010/7

N2 - 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.

AB - 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.

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Analysis of biomechanical changes after removal of instrumentation in lumbar arthrodesis by finite element analysis

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