on a set of surface markers and the relative rotations
between segments were determined using orthopedic
Euler angle definitions. The errors introduced
by inaccuracies in the definition of the embedded
coordinate system (flexion-extension axis)
and alignment were quanitified. A group of 40 normal
subjects was evaluated and the results were
presented as a normative data base that can be used
for comparison purposes. It is hoped that the joint
angle measurement technique presented in this paper
will provide a uniform method for data acquisition
so that it will be possible to compare and/or
share gait data between clinical centers.
Acknowledgment: This research was supported in part
by NIH Grant AM 34886 and N.Y.S. Department of
Health. The authors wish to thank Ms. Janet Gainey and
Mr. George Gorton for their assistance in data acquisition
and analysis and Mrs. Ann Sayre for typing the manuscript.
This work was presented in Part at the 35th Annual
Meeting of the Orthopaedic Research Society, Las Vegas,
February 6 9 , 198