Strain measurements of the tibial insert of a knee prosthesis using a knee motion simulator

Toshihiro Sera, Yuya Iwai, Takaharu Yamazaki, Tetsuya Tomita, Hideki Yoshikawa, Hisahi Naito, Takeshi Matsumoto, Masao Tanaka

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Objective The longevity of a knee prosthesis is influenced by the wear of the tibial insert due to its posture and movement. In this study, we assumed that the strain on the tibial insert is one of the main reasons for its wear and investigated the influence of the knee varus-valgus angles on the mechanical stress of the tibial insert. Methods Knee prosthesis motion was simulated using a knee motion simulator based on a parallel-link six degrees-of-freedom actuator and the principal strain and pressure distribution of the tibial insert were measured. In particular, the early stance phase obtained from in vivo X-ray images was examined because the knee is applied to the largest load during extension/flexion movement. The knee varus-valgus angles were 0° (neutral alignment), 3°, and 5° malalignment. Results Under a neutral orientation, the pressure was higher at the middle and posterior condyles. The first and second principal strains were larger at the high and low pressure areas, respectively. Even for a 3° malalignment, the load was concentrated at one condyle and the positive first principal strain increased dramatically at the high pressure area. The negative second principal strain was large at the low pressure area on the other condyle. The maximum equivalent strain was 1.3–2.1 times larger at the high pressure area. For a 5° malalignment, the maximum equivalent strain increased slightly. Conclusion These strain and pressure measurements can provide the mechanical stress of the tibial insert in detail for determining the longevity of an artificial knee joint.

Original languageEnglish
Pages (from-to)495-500
Number of pages6
JournalJournal of Orthopaedics
Volume14
Issue number4
DOIs
Publication statusPublished - Dec 1 2017

Fingerprint

Knee Prosthesis
Knee
Pressure
Mechanical Stress
Bone and Bones
Knee Joint
Posture
X-Rays

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine

Cite this

Strain measurements of the tibial insert of a knee prosthesis using a knee motion simulator. / Sera, Toshihiro; Iwai, Yuya; Yamazaki, Takaharu; Tomita, Tetsuya; Yoshikawa, Hideki; Naito, Hisahi; Matsumoto, Takeshi; Tanaka, Masao.

In: Journal of Orthopaedics, Vol. 14, No. 4, 01.12.2017, p. 495-500.

Research output: Contribution to journalArticle

Sera, T, Iwai, Y, Yamazaki, T, Tomita, T, Yoshikawa, H, Naito, H, Matsumoto, T & Tanaka, M 2017, 'Strain measurements of the tibial insert of a knee prosthesis using a knee motion simulator', Journal of Orthopaedics, vol. 14, no. 4, pp. 495-500. https://doi.org/10.1016/j.jor.2017.08.003
Sera, Toshihiro ; Iwai, Yuya ; Yamazaki, Takaharu ; Tomita, Tetsuya ; Yoshikawa, Hideki ; Naito, Hisahi ; Matsumoto, Takeshi ; Tanaka, Masao. / Strain measurements of the tibial insert of a knee prosthesis using a knee motion simulator. In: Journal of Orthopaedics. 2017 ; Vol. 14, No. 4. pp. 495-500.
@article{a19fa57386d54c3baf540b6d46504932,
title = "Strain measurements of the tibial insert of a knee prosthesis using a knee motion simulator",
abstract = "Objective The longevity of a knee prosthesis is influenced by the wear of the tibial insert due to its posture and movement. In this study, we assumed that the strain on the tibial insert is one of the main reasons for its wear and investigated the influence of the knee varus-valgus angles on the mechanical stress of the tibial insert. Methods Knee prosthesis motion was simulated using a knee motion simulator based on a parallel-link six degrees-of-freedom actuator and the principal strain and pressure distribution of the tibial insert were measured. In particular, the early stance phase obtained from in vivo X-ray images was examined because the knee is applied to the largest load during extension/flexion movement. The knee varus-valgus angles were 0° (neutral alignment), 3°, and 5° malalignment. Results Under a neutral orientation, the pressure was higher at the middle and posterior condyles. The first and second principal strains were larger at the high and low pressure areas, respectively. Even for a 3° malalignment, the load was concentrated at one condyle and the positive first principal strain increased dramatically at the high pressure area. The negative second principal strain was large at the low pressure area on the other condyle. The maximum equivalent strain was 1.3–2.1 times larger at the high pressure area. For a 5° malalignment, the maximum equivalent strain increased slightly. Conclusion These strain and pressure measurements can provide the mechanical stress of the tibial insert in detail for determining the longevity of an artificial knee joint.",
author = "Toshihiro Sera and Yuya Iwai and Takaharu Yamazaki and Tetsuya Tomita and Hideki Yoshikawa and Hisahi Naito and Takeshi Matsumoto and Masao Tanaka",
year = "2017",
month = "12",
day = "1",
doi = "10.1016/j.jor.2017.08.003",
language = "English",
volume = "14",
pages = "495--500",
journal = "Journal of Orthopaedics",
issn = "0972-978X",
publisher = "Elsevier BV",
number = "4",

}

TY - JOUR

T1 - Strain measurements of the tibial insert of a knee prosthesis using a knee motion simulator

AU - Sera, Toshihiro

AU - Iwai, Yuya

AU - Yamazaki, Takaharu

AU - Tomita, Tetsuya

AU - Yoshikawa, Hideki

AU - Naito, Hisahi

AU - Matsumoto, Takeshi

AU - Tanaka, Masao

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Objective The longevity of a knee prosthesis is influenced by the wear of the tibial insert due to its posture and movement. In this study, we assumed that the strain on the tibial insert is one of the main reasons for its wear and investigated the influence of the knee varus-valgus angles on the mechanical stress of the tibial insert. Methods Knee prosthesis motion was simulated using a knee motion simulator based on a parallel-link six degrees-of-freedom actuator and the principal strain and pressure distribution of the tibial insert were measured. In particular, the early stance phase obtained from in vivo X-ray images was examined because the knee is applied to the largest load during extension/flexion movement. The knee varus-valgus angles were 0° (neutral alignment), 3°, and 5° malalignment. Results Under a neutral orientation, the pressure was higher at the middle and posterior condyles. The first and second principal strains were larger at the high and low pressure areas, respectively. Even for a 3° malalignment, the load was concentrated at one condyle and the positive first principal strain increased dramatically at the high pressure area. The negative second principal strain was large at the low pressure area on the other condyle. The maximum equivalent strain was 1.3–2.1 times larger at the high pressure area. For a 5° malalignment, the maximum equivalent strain increased slightly. Conclusion These strain and pressure measurements can provide the mechanical stress of the tibial insert in detail for determining the longevity of an artificial knee joint.

AB - Objective The longevity of a knee prosthesis is influenced by the wear of the tibial insert due to its posture and movement. In this study, we assumed that the strain on the tibial insert is one of the main reasons for its wear and investigated the influence of the knee varus-valgus angles on the mechanical stress of the tibial insert. Methods Knee prosthesis motion was simulated using a knee motion simulator based on a parallel-link six degrees-of-freedom actuator and the principal strain and pressure distribution of the tibial insert were measured. In particular, the early stance phase obtained from in vivo X-ray images was examined because the knee is applied to the largest load during extension/flexion movement. The knee varus-valgus angles were 0° (neutral alignment), 3°, and 5° malalignment. Results Under a neutral orientation, the pressure was higher at the middle and posterior condyles. The first and second principal strains were larger at the high and low pressure areas, respectively. Even for a 3° malalignment, the load was concentrated at one condyle and the positive first principal strain increased dramatically at the high pressure area. The negative second principal strain was large at the low pressure area on the other condyle. The maximum equivalent strain was 1.3–2.1 times larger at the high pressure area. For a 5° malalignment, the maximum equivalent strain increased slightly. Conclusion These strain and pressure measurements can provide the mechanical stress of the tibial insert in detail for determining the longevity of an artificial knee joint.

UR - http://www.scopus.com/inward/record.url?scp=85034852302&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85034852302&partnerID=8YFLogxK

U2 - 10.1016/j.jor.2017.08.003

DO - 10.1016/j.jor.2017.08.003

M3 - Article

AN - SCOPUS:85034852302

VL - 14

SP - 495

EP - 500

JO - Journal of Orthopaedics

JF - Journal of Orthopaedics

SN - 0972-978X

IS - 4

ER -