Ground truth data for ultrasound assessment of thoracolumbar fascia deformation/shearing

Provided data/ultrasound videos

Here we provide ground truth data to validate ultrasound (US) measurement methods that assess shear or deformation of the thoracolumbar fascia (TLF). Studies that have done so are in the instance:

• Langevin et al. (2011). Reduced thoracolumbar fascia shear strain in human chronic low back pain. BMC Musculoskeletal Disorders, 12, 203. https://doi.org/10.1186/1471-2474-12-203
• Weber et al. (2022). The Influence of a Single Instrument-Assisted Manual Therapy (IAMT) for the Lower Back on the Structural and Functional Properties of the Dorsal Myofascial Chain in Female Soccer Players: A Randomised, Placebo-Controlled Trial. Journal of Clinical Medicine, 11(23), 7110. https://doi.org/10.3390/jcm11237110
• Brandl et al. (2023). Thoracolumbar fascia deformation during deadlifting and trunk extension in individuals with and without back pain. Frontiers in Medicine, 10, 1177146. https://doi.org/10.3389/fmed.2023.1177146
• Brandl et al. (2024). Quantifying thoracolumbar fascia deformation to discriminate acute low back pain patients and healthy individuals using ultrasound. Scientific Reports, 14(1), 20044. https://doi.org/10.1038/s41598-024-70982-7

The data contains ground truth of different velocities and distances from dynamic US measurements of the gel pad simulated the erector spinae muscle and upper tissue layers. For details regarding the gel pads, see Bartsch et al. (2023). Assessing reliability and validity of different stiffness measurement tools on a multi-layered phantom tissue model. Scientific Reports, 13(1), Article 1. https://doi.org/10.1038/s41598-023-27742-w
For this reason, we have developed a customised device based on a linear guide driven by a stepper motor, with which the mimicked tissue layers can be moved with high precision. An explanatory video with detailed information on device setup can be found in the file: Device setup.mp4

Measurements for demographics were taken according to Brandl (2024). Ultrasound measurement of thoracolumbar fascia deformation. Protocols.io. https://dx.doi.org/10.17504/protocols.io.eq2lyjbmwlx9/v1

Measurement uncertainty for distance: +/- 0.002 mm k = 2 (95% confidence interval) and for speed: +/- 0.001 mm k = 2 (95% confidence interval) according to ISO (1993). Guide to the expression of uncertainty in measurement. International Organization for Standardization, Geneva.

We further provide an example MATLAB script that demonstrate the use of the ground truth data with the open source image processing software Kinovea, Charmant, J., & contributors. (2023). Kinovea (Version 2023.1.1) Computer software. https://www.kinovea.org

Data structure