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Discrete element analysis for characterizing the patellofemoral pressure distribution: model evaluation.

John J Elias1, Archana Saranathan

  • 1Calhoun Research Laboratory, Akron General Medical Center, 400 Wabash Avenue, Akron, OH 44307, USA. john.elias@akrongeneral.org

Journal of Biomechanical Engineering
|May 31, 2013
PubMed
Summary

Computational models accurately predict how patellar tendon orientation affects patellofemoral pressure distribution. Hamstring loading significantly alters pressure, validating the computational approach for biomechanical analysis.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Computational modeling

Background:

  • Patellofemoral pressure distribution is crucial for knee joint health.
  • Understanding the influence of patellar tendon orientation is key in diagnosing and treating knee conditions.

Purpose of the Study:

  • To evaluate the accuracy of computational models in assessing patellar tendon's effect on patellofemoral pressure.
  • To analyze how hamstring loading impacts patellofemoral pressure distribution.

Main Methods:

  • Developed computational models of eight knees tested at varying flexion angles (40°, 60°, 80°).
  • Represented patellar tendon and cartilage using spring elements, simulating quadriceps and hamstring loading.
  • Minimized potential energy to determine forces and iteratively adjusted patella for equilibrium.

Main Results:

  • Hamstring loading significantly increased lateral patellar tendon orientation and posterior shift.
  • Both computational and experimental data showed increased lateral force ratio and maximum lateral pressure with hamstring loading.
  • Computational results closely matched experimental findings, with minor differences in magnitude.

Conclusions:

  • Computational modeling accurately predicts patellofemoral pressure changes due to patellar tendon orientation.
  • The validated model can be used to study biomechanical alterations in the patellofemoral joint.