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Automatic modelling of human musculoskeletal ligaments – Framework overview and model quality evaluation

Authors: Hamze, Noura; Nocker, Lukas; Rauch, Nikolaus; Walzthöni, Markus; Carrillo, Fabio; Fürnstahl, Philipp; Harders, Matthias;

Automatic modelling of human musculoskeletal ligaments – Framework overview and model quality evaluation

Abstract

BACKGROUND: Accurate segmentation of connective soft tissues in medical images is very challenging, hampering the generation of geometric models for bio-mechanical computations. Alternatively, one could predict ligament insertion sites and then approximate the shapes, based on anatomical knowledge and morphological studies. OBJECTIVE: In this work, we describe an integrated framework for automatic modelling of human musculoskeletal ligaments. METHOD: We combine statistical shape modelling with geometric algorithms to automatically identify insertion sites, based on which geometric surface/volume meshes are created. As clinical use case, the framework has been applied to generate models of the forearm interosseous membrane. Ligament insertion sites in the statistical model were defined according to anatomical predictions following a published approach. RESULTS: For evaluation we compared the generated sites, as well as the ligament shapes, to data obtained from a cadaveric study, involving five forearms with 15 ligaments. Our framework permitted the creation of models approximating ligaments’ shapes with good fidelity. However, we found that the statistical model trained with the state-of-the-art prediction of the insertion sites was not always reliable. Average mean square errors as well as Hausdorff distances of the meshes could increase by an order of magnitude, as compared to employing known insertion locations of the cadaveric study. Using those, an average mean square error of 0.59 mm and an average Hausdorff distance of less than 7 mm resulted, for all ligaments. CONCLUSIONS: The presented approach for automatic generation of ligament shapes from insertion points appears to be feasible but the detection of the insertion sites with a SSM is too inaccurate, thus making a patient-specific approach necessary.

Countries
Switzerland, Austria
Keywords

FOS: Computer and information sciences, INTEROSSEOUS MEMBRANE, 2204 Biomedical Engineering, 610 Medicine & health, 1710 Information Systems, Computational Engineering, Finance, and Science (cs.CE), Computer Science - Graphics, Humans, DEFORMITIES, Computer Science - Computational Engineering, Finance, and Science, Musculoskeletal System, Musculoskeletal Ligaments · Gaussian Process Morphable Model · Geometric Modelling · Interosseous Membrane, 2718 Health Informatics, Ligaments, Models, Statistical, 1502 Bioengineering, 2502 Biomaterials, FOREARM, ANATOMY, Graphics (cs.GR), Forearm, 10046 Balgrist University Hospital, Swiss Spinal Cord Injury Center, Algorithms, 1304 Biophysics

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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