Applications and limitations of finite element method, multibody
simulation, and hybrid modeling in bone biomechanics

Lipphaus, Andreas; Uttich, Eike; Remus, Robin; Hoffmann, A.; Bender, Beate; Witzel, U.

doi:10.1055/s-0041-1736721

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, clinical problems often exceed the sole capabilities of FE or MB models ( Lipphaus et al, 2021 ), which is why model coupling ( Khoddam-Khorasani et al, 2018 ; Liu et al, 2018 ; Khoddam-Khorasani et al, 2020 ; Favier et al, 2021b ; Honegger et al, 2021 ; Kumaran et al, 2021 ; Panico et al, 2021 ) is increasingly used. At least two separate spine models using different methods and solvers, are coupled to use results of the other model as complementary input data.…”

Section: Introductionmentioning

confidence: 99%

Muscle-driven forward dynamic active hybrid model of the lumbosacral spine: combined FEM and multibody simulation

Remus,

Selkmann,

Lipphaus

et al. 2023

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

Most spine models belong to either the musculoskeletal multibody (MB) or finite element (FE) method. Recently, coupling of MB and FE models has increasingly been used to combine advantages of both methods. Active hybrid FE-MB models, still rarely used in spine research, avoid the interface and convergence problems associated with model coupling. They provide the inherent ability to account for the full interplay of passive and active mechanisms for spinal stability. In this paper, we developed and validated a novel muscle-driven forward dynamic active hybrid FE-MB model of the lumbosacral spine (LSS) in ArtiSynth to simultaneously calculate muscle activation patterns, vertebral movements, and internal mechanical loads. The model consisted of the rigid vertebrae L1-S1 interconnected with hyperelastic fiber-reinforced FE intervertebral discs, ligaments, facet joints, and force actuators representing the muscles. Morphological muscle data were implemented via a semi-automated registration procedure. Four auxiliary bodies were utilized to describe non-linear muscle paths by wrapping and attaching the anterior abdominal muscles. This included an abdominal plate whose kinematics was optimized using motion capture data from upper body movements. Intra-abdominal pressure was calculated from the forces of the abdominal muscles compressing the abdominal cavity. For the muscle-driven approach, forward dynamics assisted data tracking was used to predict muscle activation patterns that generate spinal postures and balance the spine without prescribing accurate spinal kinematics. During calibration, the maximum specific muscle tension and spinal rhythms resulting from the model dynamics were evaluated. To validate the model, load cases were simulated from −10° extension to +30° flexion with weights up to 20 kg in both hands. The biomechanical model responses were compared with in vivo literature data of intradiscal pressures, intra-abdominal pressures, and muscle activities. The results demonstrated high agreement with this data and highlight the advantages of active hybrid modeling for the LSS. Overall, this new self-contained tool provides a robust and efficient estimation of LSS biomechanical responses under in vivo similar loads, for example, to improve pain treatment by spinal stabilization therapies.

show abstract