RESEARCH PAPERS: Other Research Papers

A Finite Helical Axis as a Landmark for Kinematic Reference of the Knee

[+] Author and Article Information
R. A. Hart

School of Medicine, University of California, San Diego, CA

C. D. Mote

Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA 94720

H. B. Skinner

University of California, San Fransisco, CA

J Biomech Eng 113(2), 215-222 (May 01, 1991) (8 pages) doi:10.1115/1.2891237 History: Received January 12, 1989; Revised December 01, 1990; Online March 17, 2008


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.

Copyright © 1991 by The American Society of Mechanical Engineers
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