Biomechanical

Publications

Investigating the Internal Stress/Strain State of the Foot Using Magnetic Resonance Imaging and FEA

This biomechanics study used a new MRI-compatible device to apply loads to the foot and, combined with finite element models, measured internal stresses and strains. It found that strategies to reduce surface pressure may not significantly reduce the more critical internal stresses, which are believed to be a key factor in the development of neuropathic foot ulcers.

FEA of Chronic Contact Stress Exposure After Intra-Articular Fracture of the Tibial Plafond

This biomechanics paper uses patient-specific finite element analysis to quantify altered contact stresses in ankles after intra-articular fractures of the tibial plafond. By comparing fractured ankles to intact contralateral ankles during the stance phase of gait, the study demonstrates that residual incongruities lead to significantly elevated and less uniform contact stress exposure.

Ultra High Molecular Weight Polyethylene Acetabular Liners

This biomechanics paper uses finite element analysis and pressure-sensitive film to compare stress levels in conventional and highly crosslinked polyethylene acetabular liners. The study found that highly crosslinked material consistently results in lower stresses, even with large femoral heads and thin liners, challenging previous assumptions about implant design.

Effects of Fusion Mass Density and Fusion Location on the Strength of a Lumbar Interbody Fusion

Shelly, Cassi Elizabeth

This biomechanical thesis uses finite element models to analyze how the density and placement of a fusion mass affect the strength of a lumbar spinal fusion. The research concludes that higher fusion density and a central-posterior location lead to a stronger construct, highlighting the importance of these factors for surgical outcomes.

Development and Validation of a Knee-thigh-hip LSDYNA Model of a 50th percentile Male

C. Silvestri

This work develops and validates a detailed finite element model of the knee-thigh-hip complex, including bones, ligaments, and muscles, to study injury biomechanics in frontal car crashes. Through simulations across varied occupant positions, it identifies how joint loading patterns and fracture mechanisms change with posture. The findings offer guidance for refining injury criteria and improving automotive safety designs.