Polytrauma and Damage Control Orthopaedics
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Direct answer
Damage control orthopaedics is a staged strategy for the injured patient in whom definitive fixation could worsen physiology, using temporary external fixation first and definitive internal fixation later. Its rationale is the second hit phenomenon, in which a major operation on a patient already stressed by trauma provokes an exaggerated inflammatory response. Early appropriate care, matched to the patient's physiology, is the principle that governs timing.
What you must remember
- Second hit: a surgical insult on top of the initial trauma can trigger systemic inflammation, leading to acute respiratory distress syndrome and multi-organ failure.
- Lethal triad: hypothermia, acidosis and coagulopathy, which together make an unstable patient worse and push surgery toward temporary fixation.
- Early appropriate care: definitive fixation is timed to physiology, meaning early when the patient tolerates it and delayed when they do not.
- Temporary fixation: external fixation of long bones and pelvis provides stability quickly with minimal blood loss and operative time.
- Delayed definitive fixation: internal fixation is done once the patient is warm, acidotic correction is complete and coagulation is restored.
- Markers of physiology: lactate, base deficit, temperature and coagulation are used to judge readiness for definitive surgery.
- Lung contusion: reamed intramedullary nailing in a patient with pulmonary contusion carries a risk of further lung injury.
A staged approach to the polytrauma patient
The sequence matters because the same operation can save or harm the patient depending on when it is done. The steps below describe the usual staging for a patient with several major injuries.
- Resuscitate first: airway, breathing and circulation are secured, with control of bleeding and early correction of the lethal triad.
- Assess physiology: lactate, base deficit, temperature and coagulation profile are checked to judge how much surgery the patient can tolerate.
- Stabilise temporarily: external fixation of femur or tibia, or pelvic stabilisation, provides skeletal stability in a short operation.
- Monitor in intensive care: the patient is warmed, corrected and observed for ongoing bleeding and for signs of the second hit.
- Definitive fixation: internal fixation is performed once physiology has recovered, usually within days, to avoid late complications.
- Rehabilitate: early mobilisation and deep vein thrombosis prophylaxis are started as soon as the patient is stable.
Where the exam tries to catch you
Most lost marks come from fixing everything at once or from ignoring the physiology before surgery.
- Trap: a polytrauma patient with a femoral shaft fracture is nailed immediately because it is the safest fixation. Correct: a patient in shock with the lethal triad is stabilised with external fixation first, since nailing can trigger the second hit.
- Trap: the second hit is caused only by blood loss during surgery. Correct: it is an inflammatory response to the operation itself, so the timing and the size of the procedure matter.
- Trap: temporary external fixation is left in place indefinitely. Correct: it is a bridge to delayed definitive fixation, which is performed once the patient can tolerate it.
Frequently asked questions
What is the second hit phenomenon in polytrauma?
The second hit phenomenon is an exaggerated systemic inflammatory response triggered by a major operation performed on a patient already stressed by trauma. It can progress to acute respiratory distress syndrome and multi-organ failure.
What is the lethal triad in damage control orthopaedics?
The lethal triad is hypothermia, acidosis and coagulopathy, which together signal a patient in physiological collapse. Its presence favours temporary external fixation over immediate definitive internal fixation.
Why is external fixation used in polytrauma patients?
External fixation is used in polytrauma patients because it stabilises long bone and pelvic fractures quickly, with less blood loss and a shorter operation. It acts as a temporary bridge to delayed definitive fixation.
What is delayed definitive fixation?
Delayed definitive fixation is the internal fixation of fractures performed after the patient's physiology has recovered, typically after several days in intensive care. Warmth, correction of acidosis and restoration of clotting make the operation safer.