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Related Experiment Videos

Posture effect on seating interface biomechanics: comparison between two seating cushions

T K Koo1, A F Mak, Y L Lee

  • 1Jockey Club Rehabilitation Engineering Centre, Hong Kong Polytechnic University, New Territories, Hong Kong.

Archives of Physical Medicine and Rehabilitation
|January 1, 1996
PubMed
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The Roho cushion is more effective than Polyurethane (PU) foam in reducing ischial pressure and improving pelvic orientation across various sitting postures for individuals with paraplegia.

Area of Science:

  • Rehabilitation Engineering
  • Biomechanics
  • Seating Technology

Background:

  • Understanding the impact of sitting posture on pressure distribution is crucial for preventing pressure sores.
  • Seating surfaces play a significant role in managing ischial pressure and maintaining pelvic alignment.

Purpose of the Study:

  • To investigate the effects of different sitting postures on ischial pressure and pelvic orientation.
  • To compare the effectiveness of Roho and Polyurethane (PU) foam cushions in mitigating these effects.

Main Methods:

  • Two cushion types (Roho, PU Foam) and six postures were tested on paraplegic subjects and normal volunteers.
  • Ischial pressure and pelvic orientation were monitored under randomized and preplanned testing sequences.

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Main Results:

  • Sitting posture significantly influenced ischial pressure and pelvic orientation in paraplegic individuals.
  • The Roho cushion demonstrated lower maximum ischial pressures compared to the PU foam cushion across various postures.
  • Greater mean pressure differences between ischial tuberosities were observed on PU foam cushions during lateral trunk bending.

Conclusions:

  • Sitting posture is a critical factor affecting ischial pressure and pelvic orientation.
  • Roho cushions are more effective than PU foam cushions in compensating for adverse postural effects on pressure distribution.