Computational Poromechanics in Knee Joint Biomechanics and Pipe-Soil Interaction

Contact Models of Human and Porcine Knee Joints

The unique feature of our knee joint model is the inclusion of fluid phase in articular cartilages and menisci using a fibril-reinforced material model, which facilitates the studies of creep and relaxation responses of the knee. Population modelling is in progress

Modelling Meniscectomy of Knee Joint

The load sharing between cartilage and meniscus in the knee joint depends on not only the joint congruence but also the fluid pressurization in cartilage and meniscus. SOIL CONSOLIDATION procedure in ABAQUS was used to model the poromechanical behaviour

Modelling Pipe-soil Interaction

The pipe-soil interaction may produce a pipe stress beyond yielding strength. Soil consolidation may also produce a substantial increment in pipe stress. Interestingly, bones share similarities in composition and mechanics with rocks (Cowin, 1999, J Bomech), and cartilages consolidate like soils (Oloyede & Broom, 1991, Clin Biomech)

New paper: Region partitioning of articular cartilage with streaming-potential-based parameters and indentation maps

Journal of the Mechanical Behavior of Biomedical Materials (current journal impact factor: 3.90), https://doi.org/10.1016/j.jmbbm.2024.106534 

Highlights

  • Introduced a streaming potential-derived parameter in clustering to characterize region-dependent cartilage inhomogeneity;
  • Partitioned regions of condyle cartilage with streaming potential, indention-relaxation and thickness maps from 24 porcine stifle joints;
  • Proposed three triangular or trapezoidal regions, as the simplest approximation to model site-specific inhomogeneity across a femoral condyle;
  • Confirmed region-dependent streaming potential variations over femoral condyles.

New lecture note: Generic modeling of contact and fluid pressures in human knee joint for a subpopulation

Lecture Notes in Computational Vision and Biomechanics, Springer

Coming soon ...

New book chapter: Three-dimensional Finite Element Modeling of Human Knee Joint

Chapter 16 in Cartilage Tissue and Knee Joint Biomechanics, Elsevier, 2023 September, ISBN: 9780323905978

The abstract and section titles

Characterizing site-specific mechanical properties of knee cartilage with indentation-relaxation maps and machine learning

Journal of the Mechanical Behavior of Biomedical Materials (journal impact factor: 4.04), https://doi.org/10.1016/j.jmbbm.2023.105826

Highlights

  • Mapped cartilage thickness and indentation-relaxation response for 14 porcine knees using data from 100-200 locations in each knee;
  • Introduced clusters/region partitions to characterize comprehensively the site-specific cartilage inhomogeneity;
  • Proposed 17 regions to approximate knee cartilage site dependence to demonstrate and test the methodology of region partition;
  • Established poromechanical properties for the regions using full relaxation data, which may facilitate joint modeling and clinical applications.

Creep behavior of human knee joint determined with high-speed biplanar video-radiography and finite element simulation

Journal of the Mechanical Behavior of Biomedical Materials (journal impact factor 3.9), https://doi.org/10.1016/j.jmbbm.2021.104905

Highlights

• Quantified in-vivo creep behavior of human knee with high-speed biplanar video-radiography during the 10-min prolonged standing

• Confirmed substantial short-term in-vivo tissue creep that has been commonly neglected in the subject-specific joint modeling

• Predicted the creep displacement as a function of time with a poromechanical model; validated the model constructed from the same participants in experiments

• Demonstrated feasibility in the validation of finite element knee models with human participants