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Patient characteristics affect hip contact forces during gait.

E De Pieri1, D E Lunn2, G J Chapman2

  • 1Institute for Biomechanics, ETH Zurich, Zurich, Switzerland.

Osteoarthritis and Cartilage
|February 18, 2019
PubMed
Summary

Hip contact forces (HCF) in total hip replacement (THR) patients increase with higher body mass index (BMI) and functional ability. Age showed a minor influence on HCF during late swing-phase.

Keywords:
BiomechanicsGaitHip contact forceStratificationTotal hip replacement

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Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Medical Engineering

Background:

  • Total hip replacement (THR) is a common procedure to address hip joint issues.
  • Understanding hip contact forces (HCF) is crucial for assessing implant longevity and patient outcomes.
  • Patient-specific factors may significantly influence biomechanical loading on hip implants.

Purpose of the Study:

  • To investigate the relationship between patient characteristics (BMI, age, function) and HCF in THR patients.
  • To analyze the influence of these factors on HCF using multibody modeling.

Main Methods:

  • 132 THR patients underwent gait analysis to collect motion data.
  • Hip contact forces (HCF) were calculated using the AnyBody Modelling System.
  • Statistical parametric mapping (SPM) analyzed the influence of BMI, age, and functional ability on HCF.

Main Results:

  • A significant positive correlation was found between BMI and HCF, with higher BMI leading to increased forces.
  • Higher functional ability correlated with significantly increased peak HCF.
  • A negative correlation between age and HCF was observed only during the late swing phase.

Conclusions:

  • Patient characteristics, particularly BMI and functional ability, significantly impact HCF at the bearing surface.
  • Current preclinical testing standards may not adequately represent the biomechanical loading experienced by THR implants in vivo.
  • These findings highlight the need to consider patient-specific factors in the design and testing of hip implants.