Polytrauma — Damage Control Orthopaedics

Overview & Rationale for Damage Control

Damage control orthopaedics (DCO) represents a fundamental paradigm shift in the surgical management of the multiply injured patient. The concept emerged from the recognition that definitive early total care (ETC) — immediate intramedullary nailing of long bone fractures within hours of injury — in physiologically unstable polytrauma patients was associated with unacceptably high rates of systemic complications including acute respiratory distress syndrome (ARDS), multiple organ failure (MOF), and death. DCO philosophy prioritises physiological stabilisation over anatomical reconstruction: temporary fracture control is achieved rapidly (external fixation), followed by intensive resuscitation and correction of the `lethal triad`, and definitive fixation is deferred until the patient is physiologically optimised.

The lethal triad (triad of death): hypothermia + acidosis + coagulopathy; these three physiological derangements are mutually reinforcing and cumulatively lethal: hypothermia impairs coagulation factor function and platelet aggregation; acidosis (from hypoperfusion and anaerobic metabolism) causes coagulopathy and impairs cardiac function; coagulopathy causes continued haemorrhage and worsening acidosis; breaking the lethal triad is the central goal of damage control resuscitation; definitive orthopaedic surgery (particularly intramedullary nailing) adds further physiological insult — bone marrow embolism, inflammatory mediator release, blood loss, anaesthetic time — which can be lethal in this context
The `second hit` concept: the initial injury (road traffic accident, fall from height) constitutes the `first hit` — causing tissue necrosis, haemorrhage, systemic inflammatory response syndrome (SIRS), and priming of the immune system; definitive surgery in an already primed/stressed inflammatory milieu constitutes the `second hit` — potentially triggering an exaggerated systemic inflammatory response leading to ARDS and MOF; DCO minimises the surgical second hit by performing only temporising, short-duration procedures in the acute phase
Historical context: the concept was formalised by Rotondo and Schwab for abdominal trauma in the 1990s and applied to orthopaedics by Scalea, Pape, and colleagues; the Berlin group (Pape et al.) defined the physiological criteria for ETC vs DCO and proposed the `border zone` concept

Patient Classification — Safe, Border, Unstable, In Extremis

Group	Physiological Criteria	Recommended Strategy	Timing
Stable (ETC appropriate)	Haemodynamically stable; no major head injury; ISS <20 (or ISS <40 without thoracic injury); lactate <2.5 mmol/L; base deficit <6 mEq/L; no coagulopathy (PT/APTT normal); temperature >35°C; transfusion <10 units; no signs of ongoing haemorrhage	Early total care (ETC) — definitive fracture fixation within 24 hours; IMN of femur and tibia; ORIF as required; proceed directly to definitive fixation	Within 24 hours of injury
Border zone (DCO vs ETC — individualise)	ISS >40; bilateral femoral fractures with ISS >20; associated moderate head injury (GCS 9–13); moderate chest injury (AIS 2–3); moderate blood loss (10–20 units transfusion); mild coagulopathy; lactate 2.5–4 mmol/L; base deficit 6–10 mEq/L; temperature 33–35°C	CONTROVERSIAL — both ETC and DCO are reported in this group; decision based on trajectory (improving vs deteriorating), surgeon experience, and local protocols; if any doubt → DCO; DCO is the safer choice when uncertain; `when in doubt — damage control`	External fixation within 2–4 hours; conversion to definitive fixation at 3–10 days
Unstable (DCO mandatory)	Haemodynamically unstable despite initial resuscitation; base deficit >8–10 mEq/L; lactate >4 mmol/L; significant coagulopathy; ongoing blood transfusion >5–10 units/hour; significant hypothermia (<33°C); severe head injury (GCS <8); severe bilateral chest trauma (AIS ≥3); abdominal/pelvic haemorrhage requiring intervention	DCO mandatory — temporary external fixation of long bone fractures; pelvic binder or pelvic external fixator for pelvic ring injuries; haemorrhage control (packing, embolisation); definitive fixation deferred to day 3–10 after physiological stabilisation	ExFix within 1–2 hours; resuscitation; definitive fixation 3–10 days
In extremis (salvage only)	Moribund — life-threatening haemodynamic instability; cardiac arrest or peri-arrest; refractory coagulopathy; base deficit >15; pH <7.0; temperature <32°C; preterminal	Life-saving interventions ONLY — haemorrhage control, airway control, pelvic binder; fractures are a secondary priority; orthopaedic surgery only if directly contributing to haemorrhage (e.g., open pelvis fracture with massive haemorrhage); survival takes absolute precedence	Immediate life-saving only; orthopaedic fixation deferred until stable

DCO Techniques & Sequence

Temporary external fixation (ExFix): the cornerstone of DCO for long bone fractures; rapid application (<30–60 minutes); controls haemorrhage by reducing fracture haematoma volume; restores gross limb alignment; reduces pain, fat embolism, and inflammatory mediator release from fracture motion; pins are placed at a safe distance from the zone of injury; does not preclude subsequent conversion to IMN; frames are simple spanning constructs — definitive reduction is NOT the goal; key fractures requiring DCO ExFix: femoral shaft fractures (spanning femoral ExFix); tibial fractures (spanning knee or ankle ExFix); periarticular fractures (spanning knee for distal femur/proximal tibia); open fractures requiring temporary stabilisation before soft tissue management
Pelvic binder and pelvic ExFix: unstable pelvic ring fractures (open book — APC type) are major sources of retroperitoneal haemorrhage; pelvic binder (SAM splint) immediately applied in the emergency department to reduce pelvic volume and tamponade haemorrhage; anterior pelvic external fixator (`Ganz clamp` or anterior pelvic frame) for definitive temporary stabilisation of the ring; angiographic embolisation for arterial pelvic bleeding; C-clamp (posterior pelvic external fixator) for Type C posterior pelvic ring injuries with ongoing haemorrhage
Damage control resuscitation (DCR): the adjunct to DCO; permissive hypotension (target systolic BP 80–90 mmHg until haemorrhage controlled — avoids dislodging clot and worsening coagulopathy from over-resuscitation with crystalloids); massive transfusion protocol (MTP) — balanced ratio 1:1:1 of packed red blood cells (PRBCs): fresh frozen plasma (FFP): platelets; tranexamic acid (TXA) — antifibrinolytic; CRASH-2 trial established TXA (1g IV bolus + 1g over 8 hours) reduces mortality in trauma when given within 3 hours of injury; temperature management (warming blankets, warm IV fluids); calcium replacement (ionised hypocalcaemia is common after massive transfusion)
Conversion to definitive fixation (DCO Phase 2): after physiological stabilisation — typically day 3–10 post-injury; physiological criteria for safe conversion: lactate <2 mmol/L; base deficit <6; temperature >35°C; no ongoing coagulopathy; haemodynamic stability without vasopressors; the inflammatory markers should be trending down; intramedullary nailing of femur and tibia; ORIF of periarticular injuries; delayed wound closure or split skin grafting for open wounds managed with negative pressure wound therapy (NPWT)

Specific Injuries in Polytrauma

Injury	DCO Approach	Definitive Treatment
Femoral shaft fracture	Temporary spanning external fixator (knee-spanning or femoral spanning); reduces haematoma; controls pain; allows nursing; converts to IMN when stable	Antegrade IMN — gold standard; performed at day 3–10 when physiological criteria met; pin-site infections from ExFix are a minor concern but do not preclude IMN if managed
Tibial shaft fracture (open/closed)	Spanning ankle or tibial ExFix; wound management (NPWT for open wounds); debridement under DCO timing	Tibial IMN at day 3–10; plastic surgery input for soft tissue reconstruction; free flap if Gustilo IIIB/C
Pelvis — open book (APC II/III)	Pelvic binder in ED; anterior pelvic ExFix in operating room if unstable; retroperitoneal packing ± embolisation for haemorrhage control	Anterior symphyseal plating ± posterior SI joint screw fixation at day 3–10
Acetabular fracture with unstable pelvis	Skeletal traction (distal femoral Steinmann pin) to maintain hip reduction and reduce haemorrhage; pelvic binder for associated pelvic ring injury	ORIF acetabulum at day 3–10 when physiologically optimised; the window for acetabular ORIF (before fibrosis) is days 3–14

Exam Pearls

DCO rationale: physiologically unstable polytrauma patients → definitive IMN nailing is a `second hit` triggering ARDS/MOF; DCO = temporary ExFix + resuscitation + deferred definitive surgery; the `lethal triad` (hypothermia + acidosis + coagulopathy) must be broken before definitive fixation
Patient classification: Stable (ISS <20, lactate <2.5, BD <6) = ETC safe; Unstable (BD >8–10, lactate >4, coagulopathy, GCS <8) = DCO mandatory; Border zone = individualise (when in doubt → DCO); In extremis = life-saving only
ExFix in DCO: rapid (<60 min); controls haemorrhage by reducing fracture haematoma; reduces fat embolism and inflammatory mediator release; gross alignment goal (not anatomical); spanning constructs; converts to IMN at day 3–10
Damage control resuscitation: permissive hypotension (systolic 80–90 mmHg until haemorrhage controlled); MTP 1:1:1 (PRBCs:FFP:platelets); TXA within 3 hours (CRASH-2); warm fluids/patient; calcium replacement; minimise crystalloids
CRASH-2 trial: tranexamic acid (1g IV bolus + 1g over 8 hours) within 3 hours of injury reduces mortality in bleeding trauma patients; antifibrinolytic; now standard of care in major trauma; must be given within 3 hours — after 3 hours may increase mortality
Conversion criteria (ExFix to IMN): lactate <2, BD <6, temperature >35°C, no coagulopathy, haemodynamically stable without vasopressors; typically day 3–10
Pelvic binder: immediate ED application for open book pelvic fracture; reduces pelvic volume and tamponades retroperitoneal haemorrhage; binder at the level of the greater trochanters (NOT the iliac crests — too high and does not close the pelvis)
Fat embolism syndrome (FES): release of marrow fat into the circulation from unstabilised fractures (especially femoral shaft); presents 24–72 hours post-injury; petechial rash (axillae, conjunctivae), respiratory failure (ARDS), confusion; early fracture stabilisation (ExFix or IMN) reduces FES risk; IMN reaming releases more marrow fat than unreamed IMN — but IMN still reduces FES vs no stabilisation

Polytrauma — Damage Control Orthopaedics

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