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Orthopedic emergency

Acute Compartment Syndrome

Acute compartment syndrome is a time-critical clinical diagnosis in which escalating intracompartmental pressure compromises muscle and nerve perfusion. Serial examination, urgent surgical involvement, selective pressure measurement in unreliable examinations, and prompt complete fasciotomy are the decisions most likely to preserve limb function.

Clinical question: How should physicians recognize, confirm when necessary, and urgently manage suspected acute compartment syndrome?
Updated August 21, 20265 minute readEmergency Medicine and Orthopedic Surgery

Diagnosis

Recognize the evolving ischemic emergency

The diagnostic priority is detecting threatened tissue perfusion before irreversible muscle and nerve injury.

Acute compartment syndrome (ACS) results from pressure elevation within a closed osteofascial compartment sufficient to impair local circulation and tissue function. Untreated disease can progress to ischemia, myonecrosis, neurologic deficit, rhabdomyolysis, limb loss, and death. PubMedAcute Compartment Syndrome of the Limbs - PMC - NIHPubMedAcute compartment syndrome: Cause, diagnosis, and ... - PMCPubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedManagement of Missed Compartment Syndrome - NCBI - NIH

Diagnosis is primarily clinical. Early findings are escalating pain that is disproportionate to the apparent injury and pain provoked by passive stretch of the muscles within the affected compartment; a tense, tender compartment supports concern. Pulses may remain present because major arterial flow can persist despite critically impaired microvascular perfusion. Pallor, pulselessness, paralysis, and established sensory loss should be interpreted as late findings rather than reassuringly absent early diagnostic criteria. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfPubMedManagement of Missed Compartment Syndrome - NCBI - NIH

Maintain a low threshold after fractures, vascular injury, crush injury, prolonged immobilization or external compression, restrictive circumferential dressings, and circumferential burn eschar. ACS can also occur after extremity surgery or prolonged procedures. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACS

Clinical findings should be interpreted by timing and examination reliability; late ischemic signs should not be awaited before surgical escalation. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedManagement of Missed Compartment Syndrome - NCBI - NIH
FindingClinical interpretationAction
Pain out of proportion or increasing analgesic requirementImportant early warning feature, particularly after trauma or compression. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfPubMedManagement of Missed Compartment Syndrome - NCBI - NIHReassess immediately, expose the limb, release external constriction, and obtain urgent surgical evaluation. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf
Pain with passive stretch; tense or tender compartmentSupports evolving ACS but must be interpreted with the injury pattern and serial examination. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfTreat as suspected ACS; do not await late neurologic or vascular findings. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedManagement of Missed Compartment Syndrome - NCBI - NIH
Paresthesia or motor deficitMay indicate advancing nerve ischemia; paralysis is a late finding. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedManagement of Missed Compartment Syndrome - NCBI - NIHUrgently involve the operative team; pressure measurement may assist only if it will not delay treatment. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf
Pallor or pulselessnessLate and ominous; may indicate severe ischemia or associated arterial injury. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedManagement of Missed Compartment Syndrome - NCBI - NIHImmediate surgical and vascular assessment as appropriate; do not consider absent earlier signs reassuring. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedManagement of Missed Compartment Syndrome - NCBI - NIH

Testing

Use pressure measurement selectively, not as a substitute for judgment

Pressure data are most useful when clinical assessment cannot reliably establish or exclude the diagnosis.

Intracompartmental pressure (ICP) measurement is an adjunct for equivocal examinations and for patients who are obtunded, sedated, or otherwise unable to report symptoms. Measurements have variable accuracy, are susceptible to technical error, and lack adequate specificity for indiscriminate screening in traumatized limbs. ScienceDirectCompartment Pressure Measurements Have Poor Specificity for Compartment Syndrome in the Traumatized LimbPubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf

No single absolute pressure threshold is definitive across all patients. A delta pressure, defined as diastolic blood pressure minus intracompartmental pressure, of 30 mm Hg or less is a commonly recommended decompression threshold when clinical findings are compatible with ACS. An absolute compartment pressure greater than 30 mm Hg is also cited as concerning, but pressure values must be interpreted alongside the clinical course and perfusion state. ScienceDirectAcute compartment syndrome of the limbfacsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACS

Imaging is not routinely required to diagnose ACS. If ACS is clinically apparent, prioritize operative decision-making over imaging or repeated confirmatory testing. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelffacsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACS

Pressure thresholds are adjunctive and should be integrated with the examination and hemodynamic context. ScienceDirectAcute compartment syndrome of the limbScienceDirectCompartment Pressure Measurements Have Poor Specificity for Compartment Syndrome in the Traumatized LimbfacsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf
Measurement resultInterpretationRecommended response
Delta pressure ≤30 mm Hg with concerning clinical findingsCommonly recommended threshold supporting decompression. ScienceDirectAcute compartment syndrome of the limbUrgent operative evaluation for fasciotomy; do not delay when ACS is clinically suspected. ScienceDirectAcute compartment syndrome of the limbPubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf
Absolute ICP >30 mm HgConcerning adjunctive result, but not independently definitive. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSIntegrate with symptoms, serial findings, blood pressure, and surgical assessment. ScienceDirectCompartment Pressure Measurements Have Poor Specificity for Compartment Syndrome in the Traumatized LimbfacsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf
Single normal or borderline ICP in a high-risk patientDoes not reliably exclude ACS because measurement error and limited specificity are recognized limitations. ScienceDirectCompartment Pressure Measurements Have Poor Specificity for Compartment Syndrome in the Traumatized LimbPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfContinue serial examinations and repeat assessment or monitoring when clinical concern persists. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf

Treatment

Escalate immediately and decompress without avoidable delay

Initial bedside actions reduce external compression but do not replace definitive treatment.

When ACS is suspected, immediately release circumferential dressings, casts, splints, and other constrictive materials to expose the limb; reassess promptly. Adequate analgesia and continued observation are appropriate while urgent surgical evaluation is arranged, but neither should postpone definitive treatment in a convincing presentation. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf

Definitive treatment is urgent fasciotomy of all involved compartments. The central clinical hazard is delay until irreversible tissue necrosis, so patients with a convincing clinical syndrome should proceed to decompression rather than await diagnostic certainty from pressure testing. ScienceDirectAcute compartment syndrome of the limbPubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute compartment syndrome: Cause, diagnosis, and ... - PMCPubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf

Document the time course of pain and neurologic change, serial findings, external constriction released, pressure values and technique if measured, consultation time, and operative disposition. Delayed diagnosis and treatment are associated with severe morbidity and are a recurrent medicolegal issue. BMJLower extremity compartment syndromePubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedManagement of Missed Compartment Syndrome - NCBI - NIH

Immediate actions in suspected ACS are intended to prevent avoidable diagnostic and operative delay. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf
Time-sensitive stepPractical actionPurpose
Remove external compressionRelease circumferential dressings and expose the skin. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...Eliminate a reversible external contributor and permit reassessment. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...
Repeat focused examinationReassess pain, passive-stretch pain, compartment tension, sensory and motor function, and perfusion after initial measures. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfDetect progression and establish whether urgent decompression is required. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf
Obtain pressure data only when neededUse ICP measurement for equivocal or unreliable examinations while maintaining surgical escalation. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfProvide objective adjunctive evidence without replacing serial clinical assessment. ScienceDirectCompartment Pressure Measurements Have Poor Specificity for Compartment Syndrome in the Traumatized LimbPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf
Definitive interventionPerform urgent fasciotomy of all involved compartments when ACS is diagnosed or strongly suspected. ScienceDirectAcute compartment syndrome of the limbPubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfRestore tissue perfusion before irreversible necrosis. PubMedAcute compartment syndrome: Cause, diagnosis, and ... - PMCPubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf

Patients with delayed or missed diagnosis

Management after substantial delay is more complex than uncomplicated early fasciotomy. With significant muscle ischemia or necrosis, debridement may be required and amputation may become necessary. In selected delayed presentations, careful observation rather than immediate extensive debridement may sometimes yield a better outcome; this decision requires specialist assessment of limb viability, systemic risk, and anticipated functional result. PubMedManagement of Missed Compartment Syndrome - NCBI - NIH

Safety

Build monitoring around patients most likely to be missed

A structured serial-assessment process is particularly important when patient-reported pain is unavailable or unreliable.

The highest-risk diagnostic failures occur when clinicians rely on a single examination, wait for pulselessness or paralysis, or assume analgesia, sedation, or regional sensory impairment excludes ACS. At-risk patients require an explicit monitoring plan and handoff language identifying the limb, mechanism, suspected compartment(s), examination limitations, and triggers for immediate reassessment. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfPubMedManagement of Missed Compartment Syndrome - NCBI - NIH

Institutional protocols for compartment-pressure measurement and escalation can reduce variation, but no pressure threshold eliminates the need for clinical judgment. The available evidence and guidelines acknowledge persisting uncertainty in diagnostic methods and optimal thresholds. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute compartment syndrome: Cause, diagnosis, and ... - PMCPubMedManagement of Acute Compartment Syndrome

Monitoring priorities differ according to examination reliability. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfPubMedManagement of Missed Compartment Syndrome - NCBI - NIH
Patient contextPrimary monitoring approachEscalation trigger
Alert patient with a reliable examinationSerial focused clinical examinations emphasizing pain trajectory and passive-stretch pain. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelffacsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSIncreasing pain, tense compartment, neurologic symptoms, or concerning examination evolution. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf
Sedated, intubated, obtunded, or otherwise noncommunicative patientFrequent documented examination with consideration of ICP monitoring when diagnosis cannot be clinically assessed. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI BookshelfPubMedManagement of Missed Compartment Syndrome - NCBI - NIHConcerning compartment findings, rising pressures in context, or inability to safely exclude ACS. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf
After extremity surgery or prolonged positioningRoutine assessment for ACS and prompt reassessment of new pain or swelling. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...Clinical findings suggestive of ACS despite an atypical mechanism. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACS

Common questions

Can palpable distal pulses exclude acute compartment syndrome?

No. Major arterial flow and distal pulses may persist despite impaired compartment perfusion. Pallor and pulselessness are late, ominous findings and should not be awaited before escalation. facsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACSPubMedManagement of Missed Compartment Syndrome - NCBI - NIH

When should intracompartmental pressure be measured?

Use pressure measurement when the examination is equivocal or unreliable, particularly in sedated, obtunded, or noncommunicative patients. It is an adjunct because technical error and limited specificity prevent it from replacing serial clinical assessment. ScienceDirectCompartment Pressure Measurements Have Poor Specificity for Compartment Syndrome in the Traumatized LimbPubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelfPubMedCompartment Syndrome of the Lower Extremity - Compartment Syndrome - NCBI Bookshelf

What pressure threshold supports fasciotomy?

A delta pressure of 30 mm Hg or less is commonly recommended when clinical findings support ACS. Absolute ICP greater than 30 mm Hg is concerning, but no isolated pressure value is definitive. ScienceDirectAcute compartment syndrome of the limbfacsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACS

Should imaging be obtained before fasciotomy in suspected ACS?

No. ACS is primarily a clinical diagnosis, and imaging is not routinely required. In a convincing presentation, diagnostic imaging or prolonged confirmation should not delay operative management. PubMedAcute Compartment Syndrome - StatPearls - NCBI BookshelffacsA Case of Lower Extremity Compartment Syndrome with an Unusual Presentation | ACS

What bedside measures should be taken while arranging surgery?

Release circumferential dressings, casts, splints, or other constriction; expose and reassess the limb; provide analgesia; and obtain urgent surgical evaluation. These measures do not replace fasciotomy when ACS remains suspected. PubMedAcute Compartment Syndrome: A Short Narrative Review of ...PubMedAcute Compartment Syndrome - StatPearls - NCBI Bookshelf

References

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