MR-compatible loading device for assessment of heel pad internal tissue displacements under shearing load.

Finite Element Tissue Strains Computation to Evaluate the Mechanical Protection Provided by a New Bilayer Dressing for Heel Pressure Injuries

“…The chosen properties were evaluated with data from indentations of the bottom heel. 40 The main cluster is defined as the cluster with the highest volume.…”

MR-based quantitative measurement of human soft tissue internal strains for pressure ulcer prevention

“…The MRI datasets used in this study have been collected in a previous study [17]. For the sake of clarity, the main details regarding the experimental setup, protocol and participant are summarized in the following paragraph.…”

“…This requirement can be complex to overcome with an MR compatible device. Moreover, this constraint does not allow for conventional control systems for the application of loads such as gravity, hydrostatic pressure or compression springs [15][16] [17]. Additionally, with dynamic loads applied, the viscoelastic properties of the biological tissues could have an impact on the mechanical response, thus increasing the complexity to estimate the tissues passive mechanical properties from the experimental measurements.…”

In vivo quantification of 3D displacement in sacral soft tissues under compression: Relevance of 2D US-based measurements for pressure ulcer risk assessment

“…DVC-MRI combination was previously used in 3D modality for the ex vivo assessment of tissue motion in the intervertebral discs (Tavana et al 2020), in rodent lungs (Arora et al 2021) and in vivo in human lower leg muscles (Yaman et al 2013) and in the heel (Trebbi et al 2021). Another 3D combination, DVC-US, combining the accessibility of the US with the completeness of the tissue motion data in 3D, was also investigated in the literature.…”

“…Results showed that 5 out of 7 tested subjects did not have notable muscle tissue under the ischial tuberosity while sitting suggesting the importance of using multi-planar imaging to assess subject-specific anatomy (Sonenblum et al 2015). Likewise, Trebbi et al combined MRI of the foot in both deformed and undeformed configurations with Digital Volume Correlation (DVC), to experimentally assess internal tissue displacements in the heel pad region (Trebbi et al 2021) under external shearing load. However, although MRI is a potential tool for the quantitative evaluation of soft tissue displacements, it has important drawbacks such as high costs, a confined environment and the requirement for the patient to not move for long periods in positions that can be uncomfortable.…”