Deep tissue injury is a serious pressure ulcer typically occurring in muscle tissues because of sustained deformations. No method currently exists for measuring internal tissue deformations noninvasively; so wheelchair cushion design and selection are based mostly on measuring sitting pressures. Here, we evaluated influences of different commercial cushions on internal tissue deformations in the buttocks, using magnetic resonance imaging (MRI). Although cushions reduced internal tissue deformations only about 10%, our interpretation suggests that they may theoretically add safe-sitting time. In the future, MRI can be a tool for evaluating the fit and design of cushions to the individual.
Volume 47 Number 1, 2010
Pages 31 — 42