Mechanics of posterior stabilized total knee arthroplasty during daily activities in relation to prosthesis condylar and post-cam design: A finite element study

Mohd Afzan Mohd Anuar, Mitsugu Todo

Research output: Contribution to journalArticle

Abstract

The mechanic of TKA prosthesis in relation to prosthesis design remains unclear despite of previous extensive research. This study attempts to observe the stress states and contact mechanics of polyethylene (PE) insert of knee prosthesis during common daily activities and their relation with condylar and post-cam design. Knee joint loadings during walking, stair climbing, chair sitting and deep squatting were applied to Scorpio Superflex and Scorpio Non-Restricted Geometry (NRG) knee implants using 6-degree-of-freedom (DOF) displacement-force driven model. Finite element models were developed in FEMAP using tetrahedron elements while motions of knee joint were modelled in LS-DYNA. Design of Superflex serves relatively good conformity but more rotational resistance that leads to surface distortion. NRG, however, has more relaxed geometry without compromising the needs of appropriate conforming articular surfaces. This research demonstrated that PE tibial insert stress conditions are closely associated with condylar and post-cam geometry. Conforming interfaces serve good wear resistance, however provide surface constraint towards motion, which leads to surface distortion.

Original languageEnglish
Pages (from-to)211-228
Number of pages18
JournalJournal of Mechanical Engineering
VolumeSI 4
Issue number4
Publication statusPublished - Nov 1 2017

Fingerprint

Arthroplasty
Cams
Mechanics
Geometry
Polyethylenes
Knee prostheses
Stairs
Wear resistance
Prostheses and Implants

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

@article{aa51e615d64642cc85633e23113e7ee8,
title = "Mechanics of posterior stabilized total knee arthroplasty during daily activities in relation to prosthesis condylar and post-cam design: A finite element study",
abstract = "The mechanic of TKA prosthesis in relation to prosthesis design remains unclear despite of previous extensive research. This study attempts to observe the stress states and contact mechanics of polyethylene (PE) insert of knee prosthesis during common daily activities and their relation with condylar and post-cam design. Knee joint loadings during walking, stair climbing, chair sitting and deep squatting were applied to Scorpio Superflex and Scorpio Non-Restricted Geometry (NRG) knee implants using 6-degree-of-freedom (DOF) displacement-force driven model. Finite element models were developed in FEMAP using tetrahedron elements while motions of knee joint were modelled in LS-DYNA. Design of Superflex serves relatively good conformity but more rotational resistance that leads to surface distortion. NRG, however, has more relaxed geometry without compromising the needs of appropriate conforming articular surfaces. This research demonstrated that PE tibial insert stress conditions are closely associated with condylar and post-cam geometry. Conforming interfaces serve good wear resistance, however provide surface constraint towards motion, which leads to surface distortion.",
author = "Anuar, {Mohd Afzan Mohd} and Mitsugu Todo",
year = "2017",
month = "11",
day = "1",
language = "English",
volume = "SI 4",
pages = "211--228",
journal = "Journal of Mechanical Engineering",
issn = "1823-5514",
publisher = "Institut Pengurusan Penyelidikan (RMI), Universiti Teknologi MARA",
number = "4",

}

TY - JOUR

T1 - Mechanics of posterior stabilized total knee arthroplasty during daily activities in relation to prosthesis condylar and post-cam design

T2 - A finite element study

AU - Anuar, Mohd Afzan Mohd

AU - Todo, Mitsugu

PY - 2017/11/1

Y1 - 2017/11/1

N2 - The mechanic of TKA prosthesis in relation to prosthesis design remains unclear despite of previous extensive research. This study attempts to observe the stress states and contact mechanics of polyethylene (PE) insert of knee prosthesis during common daily activities and their relation with condylar and post-cam design. Knee joint loadings during walking, stair climbing, chair sitting and deep squatting were applied to Scorpio Superflex and Scorpio Non-Restricted Geometry (NRG) knee implants using 6-degree-of-freedom (DOF) displacement-force driven model. Finite element models were developed in FEMAP using tetrahedron elements while motions of knee joint were modelled in LS-DYNA. Design of Superflex serves relatively good conformity but more rotational resistance that leads to surface distortion. NRG, however, has more relaxed geometry without compromising the needs of appropriate conforming articular surfaces. This research demonstrated that PE tibial insert stress conditions are closely associated with condylar and post-cam geometry. Conforming interfaces serve good wear resistance, however provide surface constraint towards motion, which leads to surface distortion.

AB - The mechanic of TKA prosthesis in relation to prosthesis design remains unclear despite of previous extensive research. This study attempts to observe the stress states and contact mechanics of polyethylene (PE) insert of knee prosthesis during common daily activities and their relation with condylar and post-cam design. Knee joint loadings during walking, stair climbing, chair sitting and deep squatting were applied to Scorpio Superflex and Scorpio Non-Restricted Geometry (NRG) knee implants using 6-degree-of-freedom (DOF) displacement-force driven model. Finite element models were developed in FEMAP using tetrahedron elements while motions of knee joint were modelled in LS-DYNA. Design of Superflex serves relatively good conformity but more rotational resistance that leads to surface distortion. NRG, however, has more relaxed geometry without compromising the needs of appropriate conforming articular surfaces. This research demonstrated that PE tibial insert stress conditions are closely associated with condylar and post-cam geometry. Conforming interfaces serve good wear resistance, however provide surface constraint towards motion, which leads to surface distortion.

UR - http://www.scopus.com/inward/record.url?scp=85042005839&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042005839&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85042005839

VL - SI 4

SP - 211

EP - 228

JO - Journal of Mechanical Engineering

JF - Journal of Mechanical Engineering

SN - 1823-5514

IS - 4

ER -