Photoelastic measurements of polymer insert stress in the knee prostheses designed for high/deep flexion

A. Lawi, J. Takiguchi, M. Hasegawa, S. Hirokawa, M. Todo, T. Hotokebuchi

Research output: Contribution to journalArticle

Abstract

This paper presents the experimental results of photoelasticity for determining the magnitude and distribution of stresses on the polyethylene insert of the knee prostheses designed for high/deep knee flexion. The prostheses used in our experiment were a conventional posterior stabiliser knee, Scorpio NRG (Non-Restricted Geometry, Stryker Co., USA) and CFK (Complete Flexion Knee, Japan Medical Material Co., Japan), which we have developed to enable the patient to make a complete knee flexion (i.e. seiza in Japanese). Prior to the photoelastic experiment, we had introduced the forces exerted on the knee joint during ascending from deep knee flexion. Here we took squatting as an example of deep knee flexion instead of seiza because ascending from seiza contains complex modalities. The introduced data in terms of knee angles and joint forces were applied to the photoelastic models. The results demonstrated that after the knee angle became larger than 90°, the shear stresses on the post and cam of NRG were higher than those on the ball and socket of CFK. We conclude that the design and the configuration of CFK is acceptable at deep knee flexion from a load-bearing viewpoint.

Original languageEnglish
Pages (from-to)177-186
Number of pages10
JournalApplied Bionics and Biomechanics
Volume7
Issue number3
DOIs
Publication statusPublished - Jan 1 2010

Fingerprint

Knee prostheses
Knee Prosthesis
Die casting inserts
Knee
Polymers
Bearings (structural)
Photoelasticity
Cams
Polyethylene
Prosthetics
Polyethylenes
Shear stress
Experiments
Geometry
Knee Joint
Japan
Weight-Bearing
Prostheses and Implants
scorpio

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Medicine (miscellaneous)
  • Bioengineering
  • Biomedical Engineering

Cite this

Photoelastic measurements of polymer insert stress in the knee prostheses designed for high/deep flexion. / Lawi, A.; Takiguchi, J.; Hasegawa, M.; Hirokawa, S.; Todo, M.; Hotokebuchi, T.

In: Applied Bionics and Biomechanics, Vol. 7, No. 3, 01.01.2010, p. 177-186.

Research output: Contribution to journalArticle

Lawi, A. ; Takiguchi, J. ; Hasegawa, M. ; Hirokawa, S. ; Todo, M. ; Hotokebuchi, T. / Photoelastic measurements of polymer insert stress in the knee prostheses designed for high/deep flexion. In: Applied Bionics and Biomechanics. 2010 ; Vol. 7, No. 3. pp. 177-186.
@article{4f6e44d856944991b791f5153b487cfa,
title = "Photoelastic measurements of polymer insert stress in the knee prostheses designed for high/deep flexion",
abstract = "This paper presents the experimental results of photoelasticity for determining the magnitude and distribution of stresses on the polyethylene insert of the knee prostheses designed for high/deep knee flexion. The prostheses used in our experiment were a conventional posterior stabiliser knee, Scorpio NRG (Non-Restricted Geometry, Stryker Co., USA) and CFK (Complete Flexion Knee, Japan Medical Material Co., Japan), which we have developed to enable the patient to make a complete knee flexion (i.e. seiza in Japanese). Prior to the photoelastic experiment, we had introduced the forces exerted on the knee joint during ascending from deep knee flexion. Here we took squatting as an example of deep knee flexion instead of seiza because ascending from seiza contains complex modalities. The introduced data in terms of knee angles and joint forces were applied to the photoelastic models. The results demonstrated that after the knee angle became larger than 90°, the shear stresses on the post and cam of NRG were higher than those on the ball and socket of CFK. We conclude that the design and the configuration of CFK is acceptable at deep knee flexion from a load-bearing viewpoint.",
author = "A. Lawi and J. Takiguchi and M. Hasegawa and S. Hirokawa and M. Todo and T. Hotokebuchi",
year = "2010",
month = "1",
day = "1",
doi = "10.1080/11762322.2010.490043",
language = "English",
volume = "7",
pages = "177--186",
journal = "Applied Bionics and Biomechanics",
issn = "1176-2322",
publisher = "IOS Press",
number = "3",

}

TY - JOUR

T1 - Photoelastic measurements of polymer insert stress in the knee prostheses designed for high/deep flexion

AU - Lawi, A.

AU - Takiguchi, J.

AU - Hasegawa, M.

AU - Hirokawa, S.

AU - Todo, M.

AU - Hotokebuchi, T.

PY - 2010/1/1

Y1 - 2010/1/1

N2 - This paper presents the experimental results of photoelasticity for determining the magnitude and distribution of stresses on the polyethylene insert of the knee prostheses designed for high/deep knee flexion. The prostheses used in our experiment were a conventional posterior stabiliser knee, Scorpio NRG (Non-Restricted Geometry, Stryker Co., USA) and CFK (Complete Flexion Knee, Japan Medical Material Co., Japan), which we have developed to enable the patient to make a complete knee flexion (i.e. seiza in Japanese). Prior to the photoelastic experiment, we had introduced the forces exerted on the knee joint during ascending from deep knee flexion. Here we took squatting as an example of deep knee flexion instead of seiza because ascending from seiza contains complex modalities. The introduced data in terms of knee angles and joint forces were applied to the photoelastic models. The results demonstrated that after the knee angle became larger than 90°, the shear stresses on the post and cam of NRG were higher than those on the ball and socket of CFK. We conclude that the design and the configuration of CFK is acceptable at deep knee flexion from a load-bearing viewpoint.

AB - This paper presents the experimental results of photoelasticity for determining the magnitude and distribution of stresses on the polyethylene insert of the knee prostheses designed for high/deep knee flexion. The prostheses used in our experiment were a conventional posterior stabiliser knee, Scorpio NRG (Non-Restricted Geometry, Stryker Co., USA) and CFK (Complete Flexion Knee, Japan Medical Material Co., Japan), which we have developed to enable the patient to make a complete knee flexion (i.e. seiza in Japanese). Prior to the photoelastic experiment, we had introduced the forces exerted on the knee joint during ascending from deep knee flexion. Here we took squatting as an example of deep knee flexion instead of seiza because ascending from seiza contains complex modalities. The introduced data in terms of knee angles and joint forces were applied to the photoelastic models. The results demonstrated that after the knee angle became larger than 90°, the shear stresses on the post and cam of NRG were higher than those on the ball and socket of CFK. We conclude that the design and the configuration of CFK is acceptable at deep knee flexion from a load-bearing viewpoint.

UR - http://www.scopus.com/inward/record.url?scp=77956402097&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956402097&partnerID=8YFLogxK

U2 - 10.1080/11762322.2010.490043

DO - 10.1080/11762322.2010.490043

M3 - Article

AN - SCOPUS:77956402097

VL - 7

SP - 177

EP - 186

JO - Applied Bionics and Biomechanics

JF - Applied Bionics and Biomechanics

SN - 1176-2322

IS - 3

ER -