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Date of Award


Degree Type

Capstone Project (On-Campus Access Only)

Degree Name

Doctor of Physical Therapy (DPT)

First Advisor

John Medeiros, PhD, PT

Second Advisor

Kenneth W. Bush, PhD, PT

Third Advisor

Richard A. Rutt, PT, PhD


Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.


Background and purpose: Pressure-relieving wheelchair cushions are key factors in the prevention of pressure ulcers. Studies have compared wheelchair cushions; however few have used realistic testing periods. The purpose of this study was to compare a newly developed cushion from Keen Mobility to a cushion from The Roho Group, a "gold standard" in pressure-relieving wheelchair cushions. A further goal was to examine changes in cushion performance over a prolonged period.

Methods: Four subjects were asked to sit for three hours on two different pressure-relieving wheelchair cushions. Pressure mapping was used to gather data on mean pressure, peak pressure, and number of sensors activated. Subjects also rated the cushions on comfort.

Results: There were significant increases in mean pressure with time for both cushions. The Keen cushion activated a significantly greater number of sensors than did the Roho cushion. Comfort tended to decrease with time for both cushions.

Conclusion and Discussion: The two cushions have a similar ability to relieve pressure; however, the Keen cushion provides better envelopment. Also, long periods of sitting correlate with increases in interface pressure.


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