Compartment syndrome (anterior, lateral, deep - superficial posterior)MANAGEMENT

ARM & ELBOW · 12 SECTIONS

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402 items

☷ Legend

01Approach to the Critical Patient/attcp45

Limb threat triage

›Limb threat priorities

›Time critical diagnosis

›Irreversible myonecrosis risk after 6 hours of ischemia

›Earlier loss possible with hypotension or vascular injury

›Escalation triggers

›Pain out of proportion with tense compartments

›Progressive neurologic deficit

›Worsening pain despite opioids

›Compartment pressure delta pressure 30 mmHg or less

›Immediate actions

›If suspected, emergent orthopedic surgery consultation

›If suspected, remove all constrictive dressings and split casts to skin

›Limb at heart level

›Supplemental oxygen if shock or hypoxemia

Monitoring and perfusion

›Perfusion and monitoring

›Hemodynamic targets

›Normotension

›Normothermia

›Avoid vasoconstriction from hypovolemia

›Limb reassessment cadence

›Every 15-30 minutes for evolving symptoms

›Neurovascular documentation before and after splinting and after cast split

Compartment anatomy map

›Leg compartments and contents

›Anterior

›Tibialis anterior

›Extensor hallucis longus

›Extensor digitorum longus

›Deep fibular nerve

›Anterior tibial artery and veins

›Lateral

›Fibularis longus

›Fibularis brevis

›Superficial fibular nerve

›Deep posterior

›Tibialis posterior

›Flexor hallucis longus

›Flexor digitorum longus

›Tibial nerve

›Posterior tibial artery and veins

›Fibular artery and veins

›Superficial posterior

›Gastrocnemius

›Soleus

›Sural nerve

›Small saphenous vein

02History/hx39

Risk context

›High risk contexts

›Tibial shaft fracture

›High risk for anterior compartment syndrome

›Risk persists after reduction and splinting

›Crush injury

›Prolonged compression

›Rhabdomyolysis risk

›Reperfusion after ischemia

›Vascular repair

›Embolic limb ischemia treatment

›Bleeding tendency

›Anticoagulants

›Bleeding diathesis

›Tight external constraint

›Circumferential cast during swelling phase

›Constrictive bandage

Symptom trajectory

›Temporal pattern

›Time since injury

›Early hours after fracture

›Delayed onset with reperfusion

›Pain trajectory

›Increasing over time

›Opioid refractory

›Paresthesia trajectory

›Progressive numbness

›New tingling in nerve distributions

Compartment specific symptom clues

›Distribution clues

›Anterior compartment

›Dorsal first web space paresthesia

›Toe extension weakness

›Lateral compartment

›Dorsum of foot paresthesia

›Foot eversion weakness

›Deep posterior compartment

›Plantar foot paresthesia

›Toe flexion weakness

›Superficial posterior compartment

›Calf tightness

›Pain with plantarflexion stretch

03Physical Exam/exam48

Core findings

›Compartment syndrome findings

›Pain out of proportion

›Early and most sensitive clinical finding

›Disproportionate to exam or imaging

›Pain with passive stretch

›Most useful bedside maneuver

›Anterior compartment stretch with passive plantarflexion of ankle and toes

›Deep posterior stretch with passive dorsiflexion of ankle and toes

›Lateral stretch with passive inversion

›Superficial posterior stretch with passive dorsiflexion and knee extension

›Tense wood like compartment

›Increased firmness compared with contralateral limb

›Sensory changes

›Early paresthesia

›Late anesthesia

›Motor deficit

›Weakness of compartment specific actions

›Late paralysis

›Pulse status

›Normal pulses do not exclude diagnosis

›Pulselessness suggests arterial injury or extreme late finding

Neurovascular mapping

›Region specific neurovascular exam

›Pulses

›Dorsalis pedis

›Posterior tibial

›Doppler signals if nonpalpable

›Capillary refill

›Toe capillary refill

›Motor testing

›Great toe extension

›Ankle dorsiflexion

›Foot eversion

›Great toe flexion

›Ankle plantarflexion

›Sensory testing

›First dorsal web space

›Dorsum of foot

›Plantar foot

›Lateral foot

PITFALLS

›Common pitfalls

›Reliance on pulses to rule out

›Pulses often intact early

›Analgesia masking pain

›Reassess after dosing changes

›Regional anesthesia considerations

›If high suspicion, avoid dense blocks that impair serial pain assessment unless surgical plan and monitoring assured

›Cast and splint underestimation

›Always split circumferential casts to skin in suspected cases

04Differential Diagnosis/ddx31

Limb pain emergencies

›Life and limb threats

›Acute arterial occlusion

›Pallor

›Poikilothermia

›Profound pulse deficit

›Necrotizing soft tissue infection

›Systemic toxicity

›Skin bullae

›Rapid progression

›Deep venous thrombosis with phlegmasia

›Massive swelling

›Cyanosis

›Septic arthritis of ankle or knee

›Fever

›Effusion

Mimics and co injuries

›Mimics and co injuries

›Severe fracture pain without compartment syndrome

›Pain improves with immobilization and analgesia

›Peripheral nerve injury

›Deficit at presentation without progressive pain

›Cellulitis

›Skin warmth and erythema without stretch pain pattern

›Muscle strain hematoma

›Focal tenderness without tense compartments

Coding support

›Medical coding

›ICD-10 compartment syndrome of lower extremity

›T79.A2

›T79.A21 right lower extremity

›T79.A22 left lower extremity

›SNOMED CT concept

›Acute compartment syndrome

05Laboratory Tests/lt22

Baseline and complications

›Labs for systemic risk and complications

›Creatine kinase for rhabdomyolysis concern

›Rising trend supports muscle injury

›Normal value does not exclude early compartment syndrome

›Creatinine and electrolytes for renal injury and hyperkalemia

›Hyperkalemia risk with reperfusion and rhabdomyolysis

›Metabolic acidosis risk

›Lactate for shock or extensive ischemia

›Elevated with systemic hypoperfusion

›Complete blood count for bleeding or infection concern

›Hemoglobin trend if hematoma or anticoagulation

›Coagulation studies when anticoagulated or bleeding concern

›INR

›aPTT

Preoperative readiness

›Perioperative labs when OR likely

›Type and screen

›Massive swelling or open fracture

›Baseline glucose

›Diabetes risk and wound healing context

Interpretation pitfalls

›Lab pitfalls

›Diagnosis is clinical and pressure based

›No lab excludes diagnosis

06Diagnostic Tests/dt48

Scoring Systems

›Severity and decision support

›Clinical diagnosis primacy

›No validated rule out score

›Serial exam central

›Pressure based criteria

›Delta pressure

›Delta pressure equals diastolic blood pressure minus compartment pressure

›Delta pressure 30 mmHg or less supports diagnosis

›Absolute pressure

›Compartment pressure 30 mmHg or higher concerning in appropriate context

›Lower thresholds if hypotension

Radiographs

›Imaging for associated injuries

›Tibia and fibula radiographs

›Include knee and ankle for long bone injury

›Post reduction imaging

›Foot and ankle radiographs if pain distribution suggests

›Lisfranc injury as high risk swelling pattern

›Imaging limitation

›Radiographs do not diagnose compartment syndrome

MRI

›Advanced imaging role

›Not for time critical diagnosis

›Delay increases harm

›Select scenarios

›Subacute exertional compartment syndrome evaluation

›Alternative diagnosis when acute syndrome excluded

›CT role

›Not for time critical diagnosis

›Delay increases harm

›Surgical planning for fractures

›Tibial plateau

›Pilon

›Calcaneus

Compartment pressure measurement

›Pressure measurement technique

›Indications

›Unreliable exam

›Altered mental status

›Intubated or sedated

›Regional anesthesia

›Equivocal symptoms with high risk injury

›Compartment selection

›Measure symptomatic compartments

›Measure all 4 leg compartments if diffuse signs

›Technique basics

›Sterile prep

›Needle insertion into compartment belly

›Avoid tendon and bone contact

›Serial measurements

›Repeat if evolving symptoms and initial pressure not diagnostic

07Disposition/dispo20

Definitive care

›Disposition pathways

›Emergent operative management

›High clinical suspicion

›Diagnostic pressures

›Progressive neurologic deficit

›Admission and observation

›High risk fracture with evolving pain

›Need for serial exams

›Need for repeat pressures

›Transfer criteria

›No emergent fasciotomy capability

›Vascular injury concern

›Polytrauma requiring trauma center

Documentation essentials

›Documentation for medicolegal risk

›Serial pain scores

›Passive stretch findings per compartment

›Motor and sensory mapping

›Pulses and Doppler status

›Cast split to skin and dressing removal timing

›Consultant communication and timing

08Treatment/t69

Immediate life-saving interventions

›Immediate stabilization

›Constriction relief

›Remove rings and external constrictors

›Split casts to skin

›Loosen splints and wraps

›Limb positioning

›Heart level

›Avoid elevation above heart if ischemia concern

›Perfusion optimization

›IV fluids for hypotension or rhabdomyolysis risk

›Avoid vasoconstrictors unless required for life saving shock management

Immobilization and Splinting

›Immobilization principles

›Splint not cast during swelling phase

›Posterior long leg splint when tibial shaft fracture unstable

›Posterior short leg plus stirrup for ankle region fractures when appropriate

›Neurovascular reassessment after immobilization

›Motor and sensory

›Pulses and capillary refill

Reduction

›Reduction priorities

›Indications

›Threatened skin

›Neurovascular compromise

›Fracture dislocation

›Post reduction requirements

›Pain reassessment

›Neurovascular reassessment

›Repeat compartment assessment

Open fracture medications and timing

›Open fracture pathway when applicable

›Antibiotics

›Cefazolin IV 2 g

›Repeat every 8 hours

›Weight 120 kg or more 3 g

›If severe beta lactam allergy, clindamycin IV 900 mg

›Repeat every 8 hours

›If gross contamination or farm injury, add gentamicin IV 5 mg/kg

›Renal dosing adjustment

›Tetanus prophylaxis

›If unknown or incomplete immunization, Td or Tdap

›If high risk wound and unknown status, add tetanus immune globulin

DVT prophylaxis when relevant

›VTE prevention considerations

›Lower limb immobilization and reduced mobility

›Local protocol alignment

›Contraindications with bleeding risk

Analgesia and supportive care

›Analgesia

›Multimodal approach

›Acetaminophen PO 1000 mg every 6 hours

›Maximum 4000 mg per 24 hours

›Opioid titration for severe pain

›Morphine IV 0.05 mg/kg

›Repeat every 10 minutes as needed

›Monitor respiratory rate and sedation

›Hydromorphone IV 0.5 mg

›Repeat every 10 minutes as needed

›Higher dose in opioid tolerant patients

›Regional anesthesia caution

›If compartment syndrome risk high, avoid dense sensory block unless definitive surgical plan and intensive monitoring

Definitive intervention

›Fasciotomy

›Surgical decompression

›All involved compartments

›Two incision four compartment decompression typical for leg

›Timing

›Emergent once diagnosis suspected or supported by pressures

›Delay increases risk of infection, contracture, amputation

Evidence levels and recommendations

›Guideline framing

›Compartment syndrome is a clinical emergency

›Expert consensus Class I recommendation for emergent surgical consultation when suspected

›Delta pressure threshold use

›Common expert consensus threshold delta pressure 30 mmHg or less

›ACEP Level C style evidence framing for adjunctive pressure measurement when exam unreliable

09Special Populations/sp24

Pregnancy

›Pregnancy considerations

›Maternal stabilization priority

›Maintain maternal perfusion for fetal oxygen delivery

›Imaging considerations

›Radiographs permissible with shielding when needed for fracture care

›Analgesia considerations

›Avoid NSAIDs in later pregnancy per obstetric guidance

›Opioid use with maternal respiratory monitoring

Geriatric

›Geriatric considerations

›Anticoagulation prevalence

›Lower threshold for hematoma related compartment syndrome

›Atypical pain reporting

›Higher reliance on serial exams and pressures

›Comorbidity burden

›Peripheral arterial disease may worsen ischemia tolerance

Pediatrics

›Pediatric considerations

›Hard to assess pain quality

›Increasing analgesic requirement as red flag

›Three As description

›Anxiety

›Agitation

›Increasing analgesic need

›Growth plate injury co risk

›Lower threshold for specialist involvement with tibial fractures

10Background/b27

Epidemiology

›Epidemiology

›Most common acute compartment syndrome site is leg

›Tibial shaft fracture is a leading cause

›Higher risk with high energy trauma

›Polytrauma association

Pathophysiology

›Pathophysiology

›Increased intracompartmental pressure

›Reduced capillary perfusion

›Tissue hypoxia

›Edema cycle amplification

›Nerve ischemia

›Paresthesia early

›Motor loss later

›Muscle ischemia

›Myonecrosis

›Rhabdomyolysis

›Hyperkalemia risk

Therapeutic Considerations

›Therapeutic rationale

›Decompression restores perfusion pressure gradient

›Fasciotomy as definitive therapy

›Positioning at heart level

›Elevation above heart reduces arterial inflow

›Dependent position increases edema

›Cast splitting to skin

›External pressure contribution reduction

›Delta pressure concept

›Perfusion depends on systemic diastolic pressure relative to compartment pressure

11Patient Discharge Instructions/pdi19

Copy discharge instructions

›Discharge instructions when low suspicion and safe discharge

›Return precautions

›Increasing pain

›Pain with passive toe or ankle movement

›New numbness or tingling

›New weakness of toes or ankle

›Increasing tightness or swelling

›Pale or cool foot

›Worsening pain despite prescribed analgesics

›Splint care

›Keep splint clean and dry

›Do not tighten wraps

›Limb positioning

›Heart level when resting

›Follow up timing

›Orthopedics within 24-72 hours based on injury pattern

›Medication safety

›Avoid excess acetaminophen total daily dose

›Avoid driving on sedating opioids

12References/r10

Clinical guidelines and evidence sources

›Evidence sources

›Orthopedic trauma texts and consensus statements on acute compartment syndrome diagnosis and decompression timing

›Delta pressure threshold 30 mmHg or less as commonly used criterion

›Absolute pressure 30 mmHg as concerning adjunct

›Emergency medicine procedural references for compartment pressure measurement devices and technique

›Serial exams and pressures for unreliable patients

›ATLS principles for limb threat assessment in major trauma

›Early recognition of compartment syndrome as limb saving priority

›ACEP evidence language alignment

›Pressure measurement as adjunct in equivocal or unreliable exam settings as ACEP Level C style evidence framing

Evidence & Review

Reviewed by SymptomDx Medical Team · Last reviewed March 6, 2026

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.