This pilot study was conducted to test the usefulness of angle-angle diagrams and phase plane plots obtained through high-speed cinematographical methods for making graded assessments of associated movements in children. Kinematic data at the shoulder, elbow, and ankle joints of normal and motorically awkward children (5-7 years old) were obtained from digitized films of normal and heel walking trials on a motor driven treadmill. A computer program was developed to smooth, calculate, differentiate, and plot data. Angle-angle diagrams depicting simultaneous joint angular displacements of (a) shoulder versus ankle and (b) elbow versus ankle revealed graded differences in decoupling of joint motion, limb excursions, and joint range-of-motion changes between the 5-year-old, 7-year-old awkward, and 7-year-old normal subject. Phase planes of the shoulder, elbow, and ankle joint were obtained by plotting joint angular displacement against joint angular velocity. Differences in size, shape, and looping behavior showed the quantity of change and whether the changes were gradual or sudden. This noninvasive methodology and eventual standardization of angle-angle diagrams and phase planes could prove to be useful in providing more precise diagnoses of associated movements and other subtle movement disorders.
Request reprints from Dr. Bryant J. Cratty, Department of Kinesiology, UCLA, 2854 Slichter Hall, 405 Hilgard Ave., Los Angeles, CA 90024.