Region-Specific Compartment Syndrome

Acute compartment syndrome is a time-critical failure of tissue perfusion inside a closed fascial space. The diagnosis is usually clinical, but the practical problem is regional: a leg, forearm, hand, foot, thigh and buttock do not fail in the same way, and they are not decompressed in the same way.

Beyond "pain out of proportion". The common teaching phrase is useful, but incomplete. A treating surgeon also needs to know which compartment is at risk, which nerve is threatened, which passive movement stretches the involved muscles, when pressure measurement adds value, and whether the planned fasciotomy actually releases the threatened compartment.

One mechanism everywhere. Swelling, bleeding, external compression or reperfusion raises compartment pressure. Venous outflow fails first, capillary perfusion falls, tissue oedema increases, and muscle and nerve ischaemia accelerates. The regional anatomy determines what fails first and how it must be released.

LegForearmHandFootThigh and Gluteal

The high-risk injuries are tibial shaft, tibial plateau, distal tibia and high-energy ankle trauma, crush injury, reperfusion and vascular repair.

The leg has four clinically important compartments:

• Anterior - tibialis anterior, extensor hallucis longus, extensor digitorum longus, the deep peroneal nerve and the anterior tibial vessels
• Lateral - peroneus longus and brevis with the superficial peroneal nerve
• Superficial posterior - gastrocnemius, soleus and plantaris
• Deep posterior - tibialis posterior, flexor hallucis longus, flexor digitorum longus, the tibial nerve and the posterior tibial vessels

The forearm is usually considered as volar, dorsal and mobile-wad compartments. The volar side contains the superficial and deep flexors, and the median, ulnar and anterior interosseous nerves are the clinically important structures.

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Forearm compartment syndrome can follow distal radius fracture, both-bone forearm fracture, paediatric supracondylar fracture, floating elbow, vascular injury, transradial access complication, burns, tight casts, bleeding disorders or contrast extravasation.

The hand is a small-compartment problem. The clinically relevant spaces include the thenar, hypothenar, adductor, dorsal interosseous and palmar interosseous compartments.

Hand compartment syndrome is commonly caused by crush injury, injection injury, extravasation, infection, burns, prolonged compression and high-energy hand fractures. A swollen hand that is painful between the metacarpals is not just a soft-tissue injury until compartment syndrome has been considered.

Foot compartment anatomy is debated, with models in the literature ranging from several broad spaces to multiple individual compartments. For clinical practice the exact count matters less than knowing that the foot can develop compartment syndrome after crush, calcaneal fracture, Lisfranc injury, Chopart injury, high-energy midfoot trauma and vascular compromise.

Thigh. The thigh has anterior, medial and posterior compartments, and femoral fracture, blunt contusion, haematoma, anticoagulation-related bleeding and vascular injury put them at risk. Look for a tense thigh, pain with knee or hip movement, and femoral or sciatic symptoms. Thigh compartment syndrome is rare, but the size of the muscle mass means that delayed diagnosis can produce major rhabdomyolysis, renal injury, neurological deficit and death.

Gluteal. The gluteal region contains powerful muscle compartments, and the sciatic nerve is at risk. Gluteal compartment syndrome is classically associated with prolonged immobilisation after loss of consciousness or substance use, but also occurs after trauma, vascular surgery, pelvic procedures and prolonged surgery or operative positioning, and in association with obesity.

Classification in compartment syndrome is less about named eponyms and more about risk stratification. The useful classifications are clinical: by region, by timing, and by diagnostic certainty, which decides the next step and so is set out under Management.

Chronic exertional compartment syndrome. Everything above is acute compartment syndrome, a surgical emergency. Its examinable counterpart, chronic exertional compartment syndrome (CECS), is a reversible, exercise-induced rise in compartment pressure, classically in the anterior or deep posterior leg of young runners and military trainees.

The story is the opposite of ACS. Cramping, aching or tightness comes on at a predictable point in exercise, sometimes with transient foot drop or paraesthesia, and resolves within minutes of stopping; the patient is normal at rest. Diagnosis is by dynamic intracompartmental pressure testing against the Pedowitz criteria, any one of:

• resting pressure 15 mmHg or more
• 1-minute post-exercise pressure 30 mmHg or more
• 5-minute post-exercise pressure 20 mmHg or more

Differentials and treatment. The key differentials are medial tibial stress syndrome, a tibial stress fracture, and popliteal artery entrapment for exertional calf symptoms. Management is activity modification, gait retraining and relative rest first, then elective fasciotomy for refractory cases, never the emergency two-incision release of ACS. Confusing the two is a classic trap.

The examination is structured, repeated and documented. The question it answers is whether this region is behaving like a threatened closed compartment, not whether the patient has all six Ps.

History. Record the time, mechanism and energy of the injury, and whether there was a fracture, dislocation, crush, burn, injection, extravasation or vascular injury. Follow the pain trajectory and analgesia escalation: an increasing opioid need after fracture, casting or fixation is suspicious. Ask about casts, splints, dressings, tourniquets and positioning, anticoagulation, a bleeding disorder or reperfusion risk, and the time since vascular repair or reduction.

Examination. Inspect for swelling, skin tension, blisters and wounds, and palpate the specific region without relying on palpation alone. Test passive stretch of the muscles in the suspected compartment, a key early clue, and document sensory and motor function by nerve distribution, because paraesthesia and weakness indicate threatened nerve perfusion. Check pulses and Doppler, then repeat the whole examination with the times recorded.

Differential diagnosis. Several conditions mimic compartment syndrome, and missing the real diagnosis in either direction is dangerous: an unnecessary fasciotomy is a large open wound, while a missed compartment syndrome costs the limb.

Imaging. Compartment syndrome is not diagnosed by X-ray, CT or MRI. Imaging is used to define fractures, dislocations and vascular injury, but it should not delay decompression when clinical ACS is clear.

When to measure. Pressure measurement is most useful when the examination cannot answer the question:

• the examination is unreliable, for any of the reasons in the diagnostic-certainty table under Management
• the examination is equivocal but the injury is high risk
• there is vascular repair, reperfusion, crush injury or prolonged compression
• small compartments of the foot or hand are suspected and clinical signs are subtle

Reading the numbers. Commonly used thresholds include:

First actions. In a high-risk injury with escalating regional pain, do not wait for pulselessness:

1. Assess the patient and mechanism.
2. Remove splints, casts, circumferential dressings and constriction.
3. Keep the limb at heart level.
4. Give analgesia, but do not let pain relief hide serial deterioration.
5. Document the regional examination: swelling, passive stretch, sensory, motor, pulses, Doppler.
6. Call for senior review.
7. Reduce dislocations and stabilise grossly unstable fractures when needed.

Diagnostic certainty then decides the next step, and each category carries its own action.

Operate now. Beyond clear clinical ACS, operate without delaying for pressure measurement when there is:

• vascular injury or repair with reperfusion swelling
• an obtunded high-risk patient with concerning pressure findings
• failed improvement after removing external compression

Observe safely. Observation is active surveillance with documented repeat checks, never a vague "wait and see" plan. It is only safe when:

• the mechanism is lower risk or the clinical picture is not convincing
• the examination is reliable and repeatable
• pressures are reassuring if measured
• there is a clear plan for timed reassessment
• staff know exactly what deterioration should trigger escalation

Special regions and patients. Four settings deserve their own note:

• Hand and foot - involve hand or foot and ankle expertise early when available
• Thigh and gluteal - prepare for rhabdomyolysis, renal monitoring and possible repeated debridement
• Vascular repair - coordinate with vascular surgery; unstable bone and reperfusion swelling both threaten the limb
• Paediatric patient - anxiety, increasing analgesic requirement and agitation may be more useful than a classic adult verbal pain description

The principle. Release every involved compartment completely, assess muscle viability and leave the wounds open. Colour, contractility, consistency and capacity to bleed guide debridement. The technique varies by region.

LegForearmHandFootThigh and gluteal

Standard teaching is the two-incision four-compartment fasciotomy:

• the lateral incision releases the anterior and lateral compartments
• the medial incision releases the superficial and deep posterior compartments
• identify and protect the superficial peroneal nerve laterally
• avoid missing the deep posterior fascia medially
• extend the releases enough to decompress the full compartment length

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Forearm fasciotomy usually begins with a generous volar release:

• release the lacertus fibrosus proximally if needed
• decompress the superficial and deep volar compartments
• include carpal tunnel release in most acute volar forearm releases
• inspect the median nerve and vascular structures carefully
• add dorsal and mobile-wad release if there is dorsal swelling, raised pressure or uncertainty

Hand fasciotomy must target the small compartments:

• dorsal incisions can decompress the interosseous compartments
• thenar and hypothenar releases are added when those compartments are involved
• the adductor compartment may need specific release
• carpal tunnel or Guyon canal release depends on nerve compression and injury pattern
• early oedema control and hand therapy are essential to avoid stiffness

Foot fasciotomy is controversial because compartment anatomy and outcome evidence are less clear. The practical approach:

• measure compartment pressures when the clinical picture is uncertain
• release clinically or pressure-positive compartments
• combine dorsal incisions with medial plantar or calcaneal-compartment access when indicated
• expect delayed wound problems and long-term clawing, stiffness or pain if diagnosis is late

Thigh. Release the anterior, posterior and medial compartments when involved. A lateral approach may access the anterior and posterior compartments, with medial release added when required. Expect large-volume muscle swelling and bleeding.

Gluteal. Release the gluteal compartments urgently when the diagnosis is clear, and assess the sciatic nerve region and muscle viability. Plan repeated debridement if muscle is non-viable, and manage rhabdomyolysis and renal risk aggressively.

The worst complication is missed or incomplete decompression. After that, morbidity comes from muscle necrosis, nerve injury, wound problems and systemic effects.

Volkmann ischaemic contracture. This is the chronic sequela of a missed or incompletely released forearm ACS: ischaemic necrosis and fibrosis of the deep flexor mass, FDP and FPL first, as they lie deepest and furthest from inflow. It produces the classic flexed, pronated claw hand that worsens on wrist extension (a positive wrist-extension/Volkmann test). The Tsuge classification grades it:

• Mild - a few digits, little or no sensory loss
• Moderate - all fingers and thumb, with intrinsic and sensory involvement
• Severe - all flexors and extensors, fixed deformity, severe sensory and intrinsic loss

Reconstruction is staged by severity. Mild-to-moderate disease is treated with splinting and dynamic therapy with excision of the fibrotic infarct, flexor slide or tendon lengthening. Severe established contracture is treated with tendon transfers, neurolysis or free functioning muscle transfer (e.g. gracilis). The exam point is that the contracture is preventable: it represents a failure to recognise and completely decompress acute forearm compartment syndrome, including the carpal tunnel, in time.

Fasciotomy is the start of treatment, not the end. After release, the goals are to confirm decompression, prevent systemic complications, keep viable tissue alive and close the wound safely. Immediate care:

• leave fasciotomy wounds open
• use non-adherent dressings or negative pressure therapy according to local practice
• repeat the neurovascular and compartment examination
• monitor CK, potassium, creatinine, urine output and acidosis in large muscle injuries
• return to theatre around 24 to 48 hours for a second look when indicated
• debride clearly non-viable muscle
• close only when swelling allows and never under tension, using delayed primary closure, gradual approximation or split-skin grafting
• splint safely and involve therapy early, especially for the hand and forearm

Outcome depends on time to diagnosis, mechanism, region, completeness of release, muscle viability, nerve injury and wound management. Limb survival is not the same as functional recovery.

Better outcomes are associated with:

• early recognition and decompression
• reliable serial examinations in high-risk patients
• complete release of all involved compartments
• coordinated vascular and orthopaedic management in reperfusion injuries
• early second look and debridement when muscle viability is uncertain
• early oedema control and rehabilitation

Poor prognostic patterns include:

• delayed presentation with neurological deficit
• thigh or gluteal syndrome with very high CK and renal injury
• compartment syndrome after prolonged compression or substance-related immobilisation
• missed foot or hand syndrome leading to chronic pain, stiffness and deformity
• incomplete fasciotomy requiring delayed revision

Controversies and Areas of Uncertainty

Several questions remain genuinely unresolved, and examiners reward candidates who can discuss them without overstating the evidence:

• The exact pressure threshold. Delta pressure under 30 mmHg is the most validated trigger, but the optimal cut-off and duration are debated, and one-time readings overcall the diagnosis. Some advocate continuous monitoring or higher delta thresholds to reduce unnecessary fasciotomy.
• Continuous monitoring versus serial clinical examination. Continuous monitoring helps in unreliable patients but is not universally available and can generate false positives; serial examination remains central where the patient is alert.
• Foot compartment release. The number of foot compartments, whether to decompress, and the surgical approach are all contested; some surgeons favour non-operative management given uncertain functional benefit and high wound morbidity.
• Gluteal compartment syndrome management. Recent evidence suggests neurologically intact patients may be managed medically with close surveillance, whereas those with an established deficit benefit from fasciotomy.
• Emerging diagnostics. Near-infrared spectroscopy, biomarkers and ultrasound elastography are investigational and not yet a substitute for clinical judgement and pressure measurement.

Acute compartment syndrome is a worldwide emergency, and the core principles are consistent across examination systems: early senior review, repeat documented examination, rapid theatre access, multidisciplinary coordination with vascular, plastic, hand and foot-and-ankle and critical-care teams, and local antimicrobial and perioperative protocols for open wounds. Reported incidence is heavily skewed toward young men with tibial diaphyseal fractures (around 2 to 3 percent of tibial shaft fractures, much higher in high-energy or multiply-injured patients).

There is no dedicated international registry for acute compartment syndrome; trauma registries (for example TARN in the UK and the German DGU TraumaRegister) capture it as a complication of fractures and crush injury rather than as a standalone dataset. The validated postfasciotomy classification (Bouklouch and Duckworth) is an emerging tool for standardised outcome reporting and audit.

High- versus limited-resource practice variation: where continuous pressure monitoring and rapid theatre access are available, equivocal cases can be monitored safely; where they are not, the threshold for clinical fasciotomy is appropriately lower, and delayed presentation after prolonged transport or compression is more common. The principle of releasing every threatened compartment completely does not change with resource setting.

Practical documentation should include:

• time of injury and time of first concern
• analgesia escalation and serial examination findings
• passive-stretch findings by region
• sensory and motor status by nerve distribution
• pressure readings if measured, with blood pressure and time recorded
• timing of fasciotomy, compartments released and muscle viability
• plan for second look, renal monitoring, closure and rehabilitation