1 / 11

Static Knee Alignment Modeling Workshop: Obese Locomotion Biomechanics

Explore modifying knee models to analyze knee malalignment in obese individuals and its impact on biomechanics. Discuss optimization methods and joint contact force distribution for research.

smithlynn
Download Presentation

Static Knee Alignment Modeling Workshop: Obese Locomotion Biomechanics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Simulation of Obese Locomotion Biomechanics • Workshop Goals: • Investigate the effects of individual muscle strength scaling on muscle force production and joint reaction forces • Refine our weighted static optimization API code to read in settings from an XML file • Knee able to resolve med-lat joint contact force distribution • Must incorporate knee alignment >> Modify Knee Model • Discuss predictive optimization approaches (over beer)

  2. Modeling Static Knee Alignment: Motivation • Obese children have ~3X greater prevalence of knee malalignment vs. NO • Malalignement as Obese adult >> much greater risk for development and progression of OA • We want to quantify both the magnitude and the distribution of the knee joint contact force

  3. Modeling Static Knee Alignment What is the correct anatomical alignment? ?

  4. Modeling Static Knee Alignment θ • For this exercise, we kept the tibiofemoral joint parallel to the ground • Added two bodies (femoral condyles, tibial plateau) • Updated joint definitions (articulations) Varus alignment

  5. Modeling Static Knee Alignment • Also made a model with valgus alignment

  6. Modeling Static Knee Alignment Check: Make sure muscles aren’t passively stretched i.e. musculo-tendon unit is the same between a neutral and malaligned knee e.g. Semitendinosus

  7. Modeling Static Knee Alignment • Reran IK>RRA>SO>JR for Valgus, Varus, and Neutral Alignment

  8. Modeling Static Knee Alignment • Axial Force • Largest with Varus alignment (Not Expected, I expected neutral) Result of forcing alignment on neutral subject

  9. Modeling Static Knee Alignment • Knee Abd/Add Moment • Largest with Varus alignment (Expected, Obvious) Abd Add

  10. Modeling Static Knee Alignment • Proof of Concept: Can incorporate radiographic knee alignment to better understand loading in future childhood obesity study • Take home message: Critical to incorporate frontal plane knee alignment if you intend to calculate medial-lateral distribution! • Future: • Balance forces and moments to resolve *approximate* medial-lateral distribution • Incorporate med-lat calculation in a JR plugin

  11. Thank you, OpenSim Team!

More Related