Periarticular Reflexes Contribute to Joint Stiffness During Valgus Loading at the Knee

Yasin Y. Dhaher, Anastasios D. Tsoumanis, William Z. Rymer

Research output: Contribution to journalConference article

Abstract

To assess the contribution of periarticular tissue afferents to knee joint varus/valgus stiffness we applied an abducting positional deflection to the fully extended knee using a servomotor and recorded the torque response using a six degree-of-freedom load-cell. EMG activity in pre-activated quadriceps and hamstrings muscles were also recorded with surface electrodes. A simple linear second order delayed model was used to describe the knee joint dynamics in the medial/lateral direction. Our results revealed that periarticular tissue reflexes resulted in a significant increase of the joint's varus-valgus stiffness. In contrast to stretch reflex action, which is modulated with background force, the periarticular tissue reflexes showed modest dependence on muscle force.

Original languageEnglish (US)
Pages (from-to)1460-1463
Number of pages4
JournalAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume2
StatePublished - Dec 1 2003
Externally publishedYes
EventA New Beginning for Human Health: Proceddings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Cancun, Mexico
Duration: Sep 17 2003Sep 21 2003

Keywords

  • Joint Stiffness
  • Passive Tissue Afferents
  • Varus/Valgus

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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