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Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine 6/2020

Open Access 20.04.2020 | Research Article

An MRI-compatible varus–valgus loading device for whole-knee joint functionality assessment based on compartmental compression: a proof-of-concept study

verfasst von: Oliver Said, Justus Schock, Nils Krämer, Johannes Thüring, Lea Hitpass, Philipp Schad, Christiane Kuhl, Daniel Abrar, Daniel Truhn, Sven Nebelung

Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine | Ausgabe 6/2020

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Abstract

Objective

Beyond static assessment, functional techniques are increasingly applied in magnetic resonance imaging (MRI) studies. Stress MRI techniques bring together MRI and mechanical loading to study knee joint and tissue functionality, yet prototypical axial compressive loading devices are bulky and complex to operate. This study aimed to design and validate an MRI-compatible pressure-controlled varus–valgus loading device that applies loading along the joint line.

Methods

Following the device’s thorough validation, we demonstrated proof of concept by subjecting a structurally intact human cadaveric knee joint to serial imaging in unloaded and loaded configurations, i.e. to varus and valgus loading at 7.5 kPa (= 73.5 N), 15 kPa (= 147.1 N), and 22.5 kPa (= 220.6 N). Following clinical standard (PDw fs) and high-resolution 3D water-selective cartilage (WATSc) sequences, we performed manual segmentations and computations of morphometric cartilage measures. We used CT and radiography (to quantify joint space widths) and histology and biomechanics (to assess tissue quality) as references.

Results

We found (sub)regional decreases in cartilage volume, thickness, and mean joint space widths reflective of areal pressurization of the medial and lateral femorotibial compartments.

Discussion

Once substantiated by larger sample sizes, varus–valgus loading may provide a powerful alternative stress MRI technique.
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Metadaten
Titel
An MRI-compatible varus–valgus loading device for whole-knee joint functionality assessment based on compartmental compression: a proof-of-concept study
verfasst von
Oliver Said
Justus Schock
Nils Krämer
Johannes Thüring
Lea Hitpass
Philipp Schad
Christiane Kuhl
Daniel Abrar
Daniel Truhn
Sven Nebelung
Publikationsdatum
20.04.2020
Verlag
Springer International Publishing
Erschienen in
Magnetic Resonance Materials in Physics, Biology and Medicine / Ausgabe 6/2020
Print ISSN: 0968-5243
Elektronische ISSN: 1352-8661
DOI
https://doi.org/10.1007/s10334-020-00844-6

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