In April 2016, the NPUAP changed the term pressure ulcer (or decubitus ulcer) to pressure injury. They also updated definitions and staging of pressure injuries.
According to the NPUAP:
A pressure injury is localized damage to the skin and/or underlying soft tissue usually over a bony prominence or related to a medical or other device. The injury can present as intact skin or an open ulcer and may be painful. The injury occurs as a result of intense and/or prolonged pressure or pressure in combination with shear. The tolerance of soft tissue for pressure and shear may also be affected by microclimate, nutrition, perfusion, co-morbidities and condition of the soft tissue.
Stage 1 Pressure Injury (previously Stage 1 pressure ulcer): Non-blanchable erythema of intact skin
Stage 2 Pressure Injury (previously Stage 2 pressure ulcer): Partial-thickness skin loss with exposed dermis
Stage 3 Pressure Injury (previously Stage 3 pressure ulcer): Full-thickness skin loss
Stage 4 Pressure Injury (previously Stage 4 pressure ulcer): Full-thickness skin and tissue loss
Unstageable Pressure Injury (previously Unstageable pressure ulcer): Obscured full-thickness skin and tissue loss
Deep Tissue Pressure Injury (previously Deep Tissue Pressure Ulcer): Persistent non-blanchable deep red, maroon or purple discoloration