Definition- a load applied at right angles
to the tissue interface.

Fast facts

  • Affected by stiffness of surface, load, tissue composition, geometry
  • Usually expressed in lb/in2 (psi) or mmHg
  • Bony prominences can be exposed to higher stresses/strains and therefore may be reflected in deep tissue injury
  • Combination of pressure with other forces may exacerbate issues
  • Pressure wounds tend to be uniform or circular in shape and tend to present with a neat appearance
  • Influence of time – high loads experienced for short periods of time can be as damaging as smaller loads experienced for long periods of time