A finite helical axis as a landmark for kinematic reference of the knee

R. A. Hart, C. D. Mote, H. B. Skinner

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Reference coordinates based on the finite helical axis for flexion of the knee from 0 to 90 deg are proposed. Six degree-of-freedom tracking allows the use of such a helical axis as a kinematic landmark for knee motion representation. Data from five human subjects in vivo are presented as a path of finite helical axes for flexion of the knee from 20 to 80 deg. The finite helical axis rotates by an average of 11.4 deg, the centrode translates an average of 19.8 mm, and the total axial translation averages 0.1 mm during flexion from 20 to 80 deg. Error due to the transducer was measured on a fixed-pivot pendulum and found to be 1.0 deg and 1.9 mm rms for the helical axis orientation and position, respectively, and 0.1 mm for the axial translation. Reproducibility and soft tissue effects on the measurements were repeatable to 4.0 deg and 2.7 mm rms in orientation and position, respectively, and 0.1 mm for the axial translations. Soft tissue errors averaged 4.9 deg and 3.6 mmm in position and orientation, and 0.3 mm in the axial translations.

Original languageEnglish (US)
Pages (from-to)215-222
Number of pages8
JournalJournal of Biomechanical Engineering
Volume113
Issue number2
DOIs
StatePublished - May 1991
Externally publishedYes

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)

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