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Ultrashort time-to-echo quantitative magnetic resonance imaging of the triangular fibrocartilage: differences in position

  • Akitaka Fujisaki
  • Takatoshi AokiEmail author
  • Hidekuni Narimatsu
  • Chie Kuwahara
  • Atsushi Nozaki
  • Kunitaka Menuki
  • Akinori Sakai
  • Yukunori Korogi
Musculoskeletal
  • 152 Downloads

Abstract

Purpose

To compare T2* values of the triangular fibrocartilage (TFC) obtained by ultrashort time-to-echo (UTE) techniques at the neutral position, ulnar flexion of the wrist, and pronation of the forearm.

Materials and methods

MR imaging was performed in ten healthy volunteers with a 3-T MR system by using an eight-channel knee coil. Coronal wrist T2* maps from three-dimensional cone UTE pulse sequences were obtained at the neutral, ulnar flexion, and pronation positions (TR: 19 ms, TE: 0.032 ms/4 ms/8 ms/12 ms, FOV: 18 cm, matrix: 430 × 430, section thickness: 1.5 mm, scan time: 8 min 31 s). UTE-T2* maps were calculated on a pixel-by-pixel basis for all structures of the wrist visualized in the coronal planes. The entire region of interest (ROI) for TFC was manually delineated, and the average T2* value was calculated for each ROI by three radiologists. The Kruskal-Wallis test, Wilcoxon signed-rank test, or intraclass correlation coefficients (ICC) were used for statistics.

Results

The difference in the average T2* value among the three groups according to the forearm/wrist position was significant (p < 0.001). The T2* value of the TFC at pronation (mean ± 2 SD: 7.92 ± 1.37 ms) was significantly lower than those at the neutral (10.08 ± 1.90 ms) and ulnar flexion positions (9.15 ± 1.03 ms) (p < 0.017). The ICC showed a substantial interobserver agreement in the T2* value measurements of the TFC (ICC = 0.986).

Conclusion

T2* relaxation time measurement of the TFC using UTE may be useful for assessing the loading effect by the forearm/wrist position.

Key Points

The T2* value of the TFC may reflect the biomechanics of the wrist joint.

Acute loading at pronation results in a decrease in the T2* value of the TFC.

Quantitative wrist UTE MRI was successfully performed in vivo.

Keywords

Magnetic resonance imaging Triangular fibrocartilage Joints Wrist Pronation 

Abbreviations

DSV

Diameter spherical volume

FOV

Field of view

ICC

Intraclass correlation coefficients

MRI

Magnetic resonance imaging

ROIs

Entire region of interest

TE

Time to echo

TFC

Triangular fibrocartilage

TFCC

Triangular fibrocartilage complex

TR

Repetition time

UTE

Ultrashort time-to-echo

Notes

Funding

The authors state that this work has not received any funding.

Compliance with ethical standards

Guarantor

The scientific guarantor of this publication is Takatoshi Aoki.

Conflict of interest

The coauthor Atsushi Nozaki is an employee of GE Healthcare, the supplier of the MR unit and pulse sequence used in this study.

Statistics and biometry

No complex statistical methods were necessary for this paper.

Informed consent

Written informed consent was obtained from all subjects (patients) in this study.

Ethical approval

Institutional Review Board approval was obtained.

Methodology

• prospective

• experimental

• performed at one institution

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Copyright information

© European Society of Radiology 2018
corrected publication 2019

Authors and Affiliations

  • Akitaka Fujisaki
    • 1
  • Takatoshi Aoki
    • 1
    Email author
  • Hidekuni Narimatsu
    • 1
  • Chie Kuwahara
    • 1
  • Atsushi Nozaki
    • 2
  • Kunitaka Menuki
    • 3
  • Akinori Sakai
    • 3
  • Yukunori Korogi
    • 1
  1. 1.Department of RadiologyUniversity of Occupational and Environmental HealthKitakyushuJapan
  2. 2.MR Applications and Workflow, Asia Pacific, GE HealthcareTokyoJapan
  3. 3.Department of Orthopaedic SurgeryUniversity of Occupational and Environmental HealthKitakyushuJapan

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