disruption of tissue associated with the surgical procedure;
delayed wound healing associated with factors such as decreased nutritional status and inadequate blood supply to wound area;
irritation of skin associated with contact with wound drainage, pressure from tubes, and use of tape;
excessive or prolonged pressure on tissues from compression dressing, knee immobilizer, or CPM machine;
damage to the skin and/or subcutaneous tissue associated with prolonged pressure on tissues, friction, and shearing while mobility is decreased.