National Physical Therapy Examination (NPTE) Practice Exam

Which abnormal wheelchair fit can increase the risk for pressure ulcers at the ischial tuberosities?

1. A seat depth that is too short

2. A seat that is too low

3. A seat that is too narrow

4. A seat that is too high

The correct answer is: A seat that is too low

A seat that is too low in a wheelchair can indeed increase the risk of pressure ulcers at the ischial tuberosities. When the seat height is insufficient, the individual's pelvis may sink lower than optimal, which can lead to increased pressure and improper distribution of weight over the seating surface. This positioning places more stress on the ischial tuberosities, particularly during prolonged sitting or transfers, potentially leading to tissue breakdown and the development of pressure ulcers. In a correctly fitted wheelchair, the seat height allows for natural alignment of the pelvis and legs, ensuring that weight is evenly distributed across the seating surface and minimizing pressure points. A seat that is too low disrupts this balance, elevating the risk of complications like pressure ulcers in susceptible areas. Proper seating adjustments are thus critically important in preventing pressure-related injuries, especially for individuals with limited mobility.