Assessment of muscle spasticity by a simple pendulum test and modeling

Jae Hoon Jun, Se Jin Kong, Chul Seung Kim, Gwang Moon Eom, Soon Hyuk Lee, Kazunori Hase

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The quantitative and objective evaluation of spasticity is desirable in rehabilitation and orthopedics where subjective evaluations are mostly used. In the present study, data from a simple pendulum test are used for the evaluation of the spasticity with the help of biomechanical modeling. The spasticity of a knee joint is modeled as nonlinear feedback of muscle lengthening velocity and the muscle length. Through the optimization of the modeling error, the feedback parameters are determined. The threshold of muscle lengthening velocity in the reflex system is suggested as a severity index of the spasticity.

Original languageEnglish
Pages (from-to)1008-1011
Number of pages4
JournalKey Engineering Materials
Volume321-323 II
Publication statusPublished - 2006


  • Feedback
  • Lengthening velocity
  • Muscle length
  • Pendulum test
  • Spasticity

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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