Overview
A mangled extremity is a limb with severe bone and soft-tissue injury that threatens its vital function. An older definition required a complex fracture plus at least two of: arterial, muscle/tendon, nerve or soft-tissue injury. These injuries usually result from high-energy blunt trauma, crush or blast, with comminuted fractures, extensive degloving or ischemia, disrupted fascial compartments and regional muscle damage. The central decision is limb salvage versus amputation, and both pathways need comprehensive rehabilitation and patient involvement. (Rockwood)
Indications and Decision-Making
Amputation is clearly indicated for life-threatening situations (for example uncontrolled hemorrhage from a crushed limb) or traumatic amputation. Outside of these, the decision is not simple. Reasons include injury heterogeneity, surgeon and patient preferences, and few large prospective studies. Polytrauma, shock, pelvic fracture and abdominal injury raise mortality and the need for early amputation. (Rockwood)
Evidence on outcomes. The LEAP study found no significant difference in disability between amputation and salvage groups. Later studies (METALS, OUTLET) showed better results after amputation in certain injury patterns. This has shifted the paradigm toward offering amputation as a viable, effective treatment option in some cases rather than only asking whether salvage is feasible. (Rockwood)
Plantar sensation. Absent plantar sensation at presentation has traditionally been a key determinant, but it may reflect transient physiologic dysfunction (ischemia, compression, contusion, traction) rather than a permanent nerve injury. Evidence indicates plantar sensation or observed nerve transection should not by itself decide salvage vs amputation. Complete tibial nerve disruption has been treated as an absolute amputation indication by some authors. (Rockwood)
Scoring systems. The MESS (Mangled Extremity Severity Score), PSI, LSI, NISSSA and Hannover Fracture Scale were developed retrospectively and are limited. MESS scores skeletal/soft-tissue injury, limb ischemia, shock and age, with a proposed amputation threshold of 7. Because of high specificity, low scores can suggest salvage is possible, but low sensitivity means high scores should not be used to predict amputation. Strict dependence on a score can lead to early amputation of a salvageable limb: for example, a transient hypotension from a splenic injury can score points that disappear after resuscitation. The Ganga Hospital Score (covering tissue, function and skeletal components, plus comorbidities) suggests amputation at 17 or above and salvage at 14 or below, with 15–16 a gray zone. The AAOS/METRC 2019 guideline advises against using lower-extremity injury scores to decide between salvage and amputation. (Rockwood)
Other factors. Smoking and nicotine use harm both amputation and salvage outcomes, so counsel cessation. Screen for psychosocial factors (depression, PTSD, anxiety, low self-efficacy, poor social support). Massive muscle loss, comorbidities, associated severe foot injury or a need for ankle fusion or free tissue transfer may favor amputation in the nonacute phase and should be discussed through shared decision-making. (Rockwood)
Ethical framework (Humbyrd).
Frame treatment as reconstruction or amputation options, not salvage with amputation as failure.
Begin with damage-control, giving time for the reconstruction vs amputation discussion.
Encourage the patient to reflect on their values and choose a plan based on them. (Rockwood)
Initial Assessment and Vascular Evaluation
Manage life-threatening injuries first, then the limb. Reduce and splint grossly deformed limbs, then repeat the vascular examination. (Rockwood)
Hard signs of arterial injury (pulsatile bleeding, expanding hematoma, thrill or bruit, or the classic signs of arterial occlusion: pulselessness, pallor, paresthesia, pain, paralysis, poikilothermia) are diagnostic of major vascular injury and warrant urgent exploration. Soft signs (nonexpanding hematoma, diminished pulse, history of bleeding, adjacent nerve deficit, injury close to the artery) are more subjective: one soft sign carries about 3% risk, multiple up to 25%. A normal pulse does not exclude injury. (Rockwood)
Compare skin color and capillary refill with the uninjured side. Reassess after resuscitation.
Ankle–brachial index (ABI): traditionally below 0.90 prompts angiography or vascular consult, but that threshold comes mostly from penetrating injury. In blunt trauma a threshold of 0.60 retained 100% sensitivity and 87% specificity for injuries that needed intervention in one study. (Rockwood)
CT angiography is the gold standard for peripheral vascular injury in lower extremity trauma (sensitivity 96.2%, specificity 99.2%). (Rockwood)
Sequence of repair vs fixation. Minimize ischemia time, since high amputation rates (up to 78%) are reported with prolonged ischemia. If the fracture is relatively stable, urgent arterial repair can precede fixation. If the fracture is highly comminuted, displaced or shortened and expected total ischemic time is under about 2.5 hours, rapid bone stabilization before vascular repair gives exposure and restores length so the repair is of adequate length. A temporary intraluminal shunt restores flow quickly, allows a fuller assessment and debridement and robust manipulation, and lets definitive repair (often with vein graft) follow after stabilization or in a later stage. (Rockwood)
Compartment syndrome. Seen in up to 59% of type IIIC open fractures. Perform fasciotomy after any revascularization. It was associated with a fourfold lower amputation risk in severely injured limbs with vascular injury. Plan the fasciotomy incisions early with the orthopaedic surgeon so they do not compromise later reconstruction. (Rockwood)
Treatment
Surgical debridement
Perform a thorough, systematic debridement of all contaminated and devitalized tissue, starting with skin and subcutaneous tissue.
The injury has zones: a central zone of necrosis, a marginal zone of stasis (ischemic penumbra, uncertain survival), and a peripheral zone of minimal damage at risk from delayed physiologic response.
Extend wounds or make separate extensile incisions, aligned axially so they do not create "at-risk" flaps or prevent later reconstruction.
Test muscle viability by the four Cs: contractility, consistency, color and capillary bleeding. Debride nonviable muscle regardless of the expected functional loss.
Necrosis from the marginal zone may exceed the initial loss, so serial debridements are needed until all nonviable tissue is removed and hemostasis is achieved.
Irrigate with saline. The FLOW trial of 2,551 open fractures found no difference between high and low pressure, and soap gave a higher reoperation rate than saline. In a type III subgroup saline was better than soap. (Rockwood)
Local antibiotic delivery (antibiotic cement beads) before closure reduces infection in severe open fractures. A retrospective study of 113 type IIIB tibial fractures found lower infection with antibiotic beads alone than with NPWT alone or NPWT plus beads. (Rockwood)
Skeletal stabilization
Stabilization limits ongoing soft-tissue damage and promotes wound healing. In an animal study, infection in unstable fixation was almost twice that of stable fixation.
Initial temporary options: splinting, skeletal traction, damage-control plating, external fixation. Definitive options: external fixation (ring), intramedullary nail or plate. If repeat debridements are planned, definitive fixation must not block access to reassess damaged tissue.
Most limb-threatening injuries are type IIIB or IIIC open fractures. Temporary external fixation is attractive: rapid, no fluoroscopy needed, and it allows later repositioning for debridement. Conversion to definitive internal fixation can be delayed with good results.
External fixation as definitive diaphyseal treatment has had higher complications and worse results than nailing in several studies. In the FIXIT randomized trial of 260 patients with severe open tibial fractures, ring fixators had a higher major complication rate than intramedullary nailing (62% vs 44%), with similar infection and union rates. (Rockwood)
Large defects can be addressed with ring fixation and bone transport (one case with a 17-cm defect healed with a proximal tibial osteotomy and bone transport). (Rockwood)
Hyperbaric oxygen (adjunct)
The proposed benefit is in the zone of marginally viable tissue. A randomized, placebo-controlled study of crush injuries and several case series show benefit. The HOLLT randomized trial in open tibial fractures (12 sessions over 8 days) found less tissue necrosis (29% vs 53%) and fewer late complications (12% vs 35%). Evidence is insufficient to make it standard, and critically ill patients may not tolerate it. (Rockwood)
Soft-tissue closure
Successful salvage requires a healed wound over an aseptic, united fracture. Coverage is often a free flap or rotational muscle flap (see the soft tissue coverage guide).
In one study, 27% of high-energy tibial injuries needing reconstruction had at least one wound complication within 6 months. In a retrospective review of 806 lower-extremity reconstructions, preoperative angiography showed arterial damage in 52% of limbs with type IIIB/IIIC fractures. Flap failure risk was 1.6 times higher with two-vessel flow and 2.2 times higher with single-vessel flow than three-vessel flow. Flaps with two venous outflows had four times fewer complications than single-venous-outflow flaps.
Timing is debated. One analysis found no advantage to muscle flap closure within 72 hours in mangled limbs with open tibial fractures, although many authors favor early reconstruction (within 72 hours) for lower infection, flap failure and nonunion. (Rockwood)
Postoperative Care
Comprehensive rehabilitation (physical therapy, occupational therapy, behavioral health support) is recommended after high-energy lower-extremity trauma, whichever pathway is chosen. Orthoses or prostheses should be offered as appropriate. (Rockwood)
Complications
Infection, nonunion, flap failure and wound complications are the principal problems in salvage. (Rockwood)
Secondary (late) amputation after a prolonged salvage attempt is a recognized outcome, which scoring systems and early planning aim to anticipate. (Rockwood)
Poor outcome predictors in the LEAP study (after adjusting for injury severity) included major complications, lower education, low income and no private insurance, active smoking, low self-efficacy and social support, and involvement in legal proceedings. (Rockwood)
References
Chapter 18, mangled extremity. In: Tornetta P III, Ricci WM, Ostrum RF, McKee MD, Ollivere BJ, de Ridder VA, eds. Rockwood and Green's Fractures in Adults. 10th ed. Wolters Kluwer; 2024 (Turkish edition: Erişkin Kırıkları).