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Validity of DynaPort GaitMonitor for Assessment of Spatiotemporal Parameters in Amputee Gait

By Houdijk, Han; Appelman, Franka M.; Van Velzen, Judith M.; Van der Woude, Lucas H.V.; Van Bennekom, Coen A.M.; Journal of Rehabilitation Research and Development, Vol. 45, No. 9, pp. 1335-1342
Publication Date: 2008

Study assessed the validity of the DynaPort GaitMonitor software for assessing the walking ability of people with lower limb prostheses. Study participants were 10 men and 4 women with lower-limb prostheses and a mean age of 49 years. Participants walked on a straight-level walkway at a self-selected speed over distances of 20, 25, 30, and 35 meters while pelvis accelerations were measured using a triaxial accelerometer. Mean spatiotemporal parameters were derived from these measurements using the DynaPort GaitMonitor software. Similar parameters were simultaneously determined from video. Overall, the number of steps, mean step time, step length, and walking speed were detected accurately by the GaitMonitor software. No systematic deviation was found, and the accuracy of the different parameters was within 6.5 percent; however, step times measured separately for both the intact and prosthetic legs differed considerably between the GaitMonitor and the video. Step time was systematically underestimated by the GaitMonitor for the intact leg and overestimated for the prosthetic leg. The study concludes that the DynaPort GaitMonitor is a valid instrument for assessing mean spatiotemporal parameters in amputee gait during controlled walking conditions, although systematic errors in prosthetic and intact heel strike detection prevent a reliable analysis of walking symmetry. The authors recommend that the validity of the system under more complex walking conditions in daily life be the topic of future study.

Assistive Products Discussed: DYNAPORT MOVE MONITOR
Published by:

VA Rehabilitation Research & Development Service    (Web Site: http://www.rehab.research.va.gov )
Link to text: http://www.rehab.research.va.gov/jour/08/45/9/houdijk.html
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