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Medial meniscal displacement and strain in three dimensions under compressive loads: MR assessment
Author(s) -
Freutel Maren,
Seitz Andreas M.,
Galbusera Fabio,
Bornstedt Axel,
Rasche Volker,
Knothe Tate Melissa L.,
Ignatius Anita,
Dürselen Lutz
Publication year - 2014
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.24461
Subject(s) - medial meniscus , meniscus , displacement (psychology) , compression (physics) , strain (injury) , materials science , magnetic resonance imaging , anatomy , knee joint , joint (building) , biomedical engineering , osteoarthritis , medicine , structural engineering , mathematics , surgery , composite material , geometry , radiology , psychology , alternative medicine , incidence (geometry) , pathology , engineering , psychotherapist
Purpose To investigate the 3D displacement and the local strain of the medial meniscus and its attachments under compressive loading. Materials and Methods Magnetic resonance imaging (MRI) scans of six porcine knee joints were performed under unloaded and loaded conditions (100% and 200% body weight [BW]). Volumes were registered to obtain a 3D displacement field of the medial meniscus and its attachments, which were divided into five anatomic compartments. Finally, displacements of the center of mass of each compartment and the local strain were analyzed. Results The meniscus and its attachments significantly displaced by up to 2.6 ± 1.2 mm ( P < 0.01) under knee joint loads of 200% BW. An increase of 0.9 mm in the distance between posterior and anterior horn ( P < 0.001) was observed. The meniscus and its attachment showed an average radial stretch of 0.6%, an average circumferential stretch of 0.9%, and an average axial compression of 11.6% at 200% BW. Conclusion High‐resolution MRI was successfully combined with image registration to investigate the displacement and strain of the meniscus and its attachments under compression. The results of this study contribute to the basic understanding of meniscal movement which may impact the design of meniscal implants and the validation of finite element models in the future. J. Magn. Reson. Imaging 2014;40:1181–1188 . © 2013 Wiley Periodicals, Inc .