To provide pressure relief at the high pressure areas of the buttocks, small holes were drilled on the polyurethane (PU) foam cushion under the ischial tuberosities areas. This modification was done to locally lower the supporting property of the cushion. This approach could be easily implemented in the clinical setting. Measurements of interfacial pressures at the ischial tuberosities on such modified cushions for eight nondisabled subjects showed an average pressure 25% lower than those measured on foam cushions without modification (p < 0.01). The maximum pressure was 30% lower after modification (p < 0.01) The peak pressure gradient also showed a 38% decrease on modified foam compared to those measured on unmodified foam cushions (p < 0.01). Simple hole drilling could potentially provide an effective approach to enhance the pressure-relief characteristics of foam cushions.
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