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Pressure and temperature patterns under the ischial tuberosities

R P Patterson, S V Fisher

    Bulletin of Prosthetics Research
    |January 1, 1980
    PubMed
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    Paraplegic individuals experienced prolonged sitting pressures, yet most avoided skin breakdown. Average pushup intervals suggest effective pressure relief, though some experienced extended uninterrupted sitting without developing ulcers.

    Area of Science:

    • Rehabilitation Medicine
    • Biomedical Engineering
    • Clinical Biomechanics

    Background:

    • Prolonged sitting can lead to pressure ulcers in paraplegic individuals.
    • Understanding pressure distribution and relief patterns is crucial for preventing tissue damage.

    Purpose of the Study:

    • To investigate pressure relief patterns under the ischial tuberosities in paraplegic subjects.
    • To assess the effectiveness of standard seating interventions in managing pressure distribution.

    Main Methods:

    • 12 paraplegic subjects were instrumented with pressure transducers and thermistors.
    • Subjects engaged in daily activities for a day while seated on a foam cushion.
    • Pressure data and pushup durations were recorded throughout the day.

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    Main Results:

    • Subjects spent significant time at pressures exceeding 30, 90, and 150 mmHg.
    • Average time between pushups was within recommended limits (10-30 minutes) for ulcer prevention.
    • Some subjects experienced prolonged uninterrupted sitting periods without developing ulcers.

    Conclusions:

    • Standard foam cushions and typical patient activity may provide adequate pressure relief for some paraplegic individuals.
    • Individual responses to pressure vary, and further research is needed to understand factors contributing to ulcer development.
    • The study highlights the importance of regular pressure relief, even if brief, in preventing pressure-related complications.