Annals of Biomedical Engineering

, Volume 43, Issue 5, pp 1089–1097 | Cite as

Alterations in Sagittal Plane Knee Kinetics in Knee Osteoarthritis Using a Biomechanical Therapy Device

  • Eytan M. Debbi
  • Alon Wolf
  • Yulia Goryachev
  • Nimrod Rozen
  • Amir Haim


Knee frontal (adduction/abduction) and sagittal (flexion/extension) moments have been implicated in the pathomechanics of knee osteoarthritis (OA). The aim of this study was to evaluate the change in the knee sagittal moment in a cohort of patients with knee OA undergoing a biomechanical training program. Twenty-five female patients with symptomatic medial compartment knee OA were enrolled in a customized biomechanical intervention program. All patients underwent consecutive gait analyses prior to treatment initiation, and after 3 months and 9 months of therapy. Self-evaluative questionnaires, spatiotemporal gait parameters, peak knee sagittal moments, knee sagittal impulses, and duration of knee moments were compared throughout the duration of therapy. Differences between baseline and follow-up values were examined using nonparametric tests. Peak knee flexion moment (KFM) at loading response decreased significantly with therapy (p = 0.001). Duration of KFM and impulse of knee flexion also decreased significantly (p = 0.024 and p = 0.029, respectively). These changes were accompanied by increased walking velocity, significant pain reduction, and increased functional activity. Post-training kinetic evaluation demonstrated profound alterations of knee sagittal moments at the loading response KFM. We speculate that knee sagittal moments can potentially be improved in patients with knee OA over time with a biomechanical training program.


Kinetics Moment Flexion Extension Gait Pain Stiffness Function 



The authors thank APOS-Medical and Sports Technologies Ltd. for their generosity in contributing the devices used in the study.

Funding statement

This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.

Conflict of interest

No author has any conflict of interest to declare.


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Copyright information

© Biomedical Engineering Society 2014

Authors and Affiliations

  • Eytan M. Debbi
    • 1
  • Alon Wolf
    • 1
  • Yulia Goryachev
    • 1
  • Nimrod Rozen
    • 2
  • Amir Haim
    • 1
    • 3
  1. 1.Biorobotics and Biomechanics Laboratory, Faculty of Mechanical EngineeringTechnion-Israel Institute of TechnologyHaifaIsrael
  2. 2.Department of Orthopedic SurgeryHa’Emek Medical CenterAfulaIsrael
  3. 3.Department of Orthopedic SurgerySourasky Medical CenterTel AvivIsrael

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