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An Instrumentation Approach for Assessing the Effects of a Hand Positioning Device on Reaching Motion of Children with Cerebral Palsy

The effects of a hand positioning device (HPD) on the quality of upper-extremity movement of five children with cerebral palsy were examined in this pilot study. Hand position was monitored during a reaching task using a single-point, 3°-of-freedom, three-dimensional tracker device. Three-dimensional path length, average velocity, movement time, response time, and the number of accelerations and decelerations (movement units) were measured. Operational definitions for each of these variables were developed for this study. Each subject performed 15 reaching trials at a pretest and posttest. A 6-week intervention period followed the pretest where each subject wore the HPD for 1 hour daily for functional activities. Group results showed no significant differences for any of the variables being measured. However, individual data analysis revealed that the HPD has the potential for modifying the quality of reaching motions in some children with cerebral palsy. The nature of the changes observed among these five subjects is discussed, as well as suggestions for future research studies. Finally, this initial study shows that the tracker is a sensitive method for recording qualitative changes in the upper-extremity motion of children with cerebral palsy in occupational therapy research.