Compartment Syndrome

Lower Limb

Overview

Compartment syndrome is a surgical emergency characterized by elevated interstitial pressure within a closed fascial compartment that compromises microcirculation and tissue function. It can occur acutely following trauma, crush injury, or intensive exercise, or chronically from repetitive overuse. Without rapid decompression, irreversible tissue damage, permanent disability, and loss of limb function can result.

Pathophysiology

Compartments are enclosed spaces bounded by inelastic fascia containing muscles, nerves, and blood vessels. When pressure within a compartment rises above capillary perfusion pressure (typically >30-40 mmHg), microcirculatory compromise occurs. This leads to tissue hypoxia, cellular edema, increased capillary permeability, and a vicious cycle of rising pressure. Prolonged ischemia causes muscle necrosis, nerve damage, and potential rhabdomyolysis with acute kidney injury. The leg has four compartments (anterior, lateral, deep posterior, superficial posterior), each vulnerable to syndrome development.

Patient Education

Compartment syndrome is a medical emergency requiring immediate hospital evaluation if severe pain out of proportion to clinical findings, pain with passive stretch of involved muscles, or neurological changes occur; do not delay seeking emergency care.

Typical Presentation

Site

Anterior or lateral lower leg most common; can affect any compartment (forearm, thigh, buttock, hand, foot)

Quality

Severe, deep, aching pain; burning sensation; progressive tightness and fullness in compartment

Intensity

Severe pain (8-10/10) disproportionate to apparent injury; worsens over hours to days

Aggravating

Passive stretching of muscles in affected compartment (pathognomonic); swelling; elevation may worsen pain; active muscle contraction

Relieving

Early decompression is only effective treatment; elevation and ice provide minimal relief; analgesia often ineffective

Associated

Swelling and firmness of compartment; paresthesias (numbness, tingling) in distribution of compressed nerves; muscle weakness; coldness or pallor; tense, turgid compartment; pain out of proportion to findings; eventual neurological deficit (late sign)

Orthopaedic Tests

Pain with Passive Stretch

Procedure

Passively stretch the muscles of the affected compartment. For anterior compartment, dorsiflex the ankle; for posterior compartment, plantarflex the ankle; for lateral compartment, invert the foot.

Positive Finding

Severe pain disproportionate to clinical findings, or pain out of proportion to the injury mechanism

Reference: Olson & Glasgow, 2005, Journal of the American Academy of Orthopaedic Surgeons

Interpretation

Pain with passive stretch is a classic clinical sign of compartment syndrome. Disproportionate pain is a red flag warranting urgent measurement of compartment pressures; this is considered the most sensitive clinical indicator but requires high clinical suspicion.

Compartment Pressure Measurement (Wick Catheter or Slit Catheter)

Procedure

Insert a pressure-monitoring catheter (Wick or slit catheter) directly into the affected compartment using sterile technique. Record compartment pressure and compare to diastolic blood pressure (delta P).

Positive Finding

Absolute pressure ≥30 mmHg, or delta P (diastolic BP minus compartment pressure) ≤30 mmHg

Reference: McQueen & Court-Brown, 1996, Journal of Bone and Joint Surgery (British)

Interpretation

Compartment pressure measurement is the gold standard for diagnosing acute compartment syndrome. Delta P ≤30 mmHg or absolute pressure ≥30 mmHg indicates the need for fasciotomy. This is an objective, invasive test essential when clinical suspicion is high.

Loss of Sensation (Two-Point Discrimination or Light Touch)

Procedure

Perform light-touch testing or two-point discrimination in the distribution of nerves traversing the affected compartment. Document any areas of diminished or absent sensation.

Positive Finding

Diminished or absent sensation in nerve distribution (e.g., dorsal first web space for anterior compartment with deep peroneal nerve involvement)

Reference: Olson & Glasgow, 2005, Journal of the American Academy of Orthopaedic Surgeons

Interpretation

Loss of sensation is a late sign indicating significant nerve ischaemia and irreversible tissue damage. Its presence suggests compartment syndrome is advanced; absence does not rule out the condition. Early surgical intervention should not be delayed while awaiting sensory changes.

Muscle Weakness (Strength Testing)

Procedure

Perform manual muscle testing of muscles within the suspected compartment. For anterior compartment, test foot dorsiflexion (L5); for posterior compartment, test plantarflexion and toe flexion (S1–S2); for lateral compartment, test foot eversion (L5–S1).

Positive Finding

Progressive weakness or loss of muscle strength in the compartment distribution

Reference: Olson & Glasgow, 2005, Journal of the American Academy of Orthopaedic Surgeons

Interpretation

Muscle weakness is another late sign indicating advanced ischaemia and potential permanent neural or muscular damage. Early presentation typically shows normal strength. Weakness mandates urgent intervention to prevent irreversible morbidity.

Pulselessness (Distal Pulses)

Procedure

Palpate distal pulses (dorsalis pedis and posterior tibial) distal to the suspected compartment syndrome. Compare limb colour and temperature between sides.

Positive Finding

Absent distal pulses, pallor, or cool skin temperature

Reference: Olson & Glasgow, 2005, Journal of the American Academy of Orthopaedic Surgeons

Interpretation

Absent pulses are a late finding indicating severe, advanced compartment syndrome with vascular compromise. Pulses may be preserved early in compartment syndrome since venous pressure (not arterial pressure) rises first. Do not rely on pulse presence to exclude the diagnosis.

AI

Tense, Swollen Compartment (Clinical Palpation)

Procedure

Gently palpate the affected compartment. Assess for tense, firm, or rock-hard consistency; compare to the contralateral limb.

Positive Finding

Visibly swollen, tense compartment with firm or board-like consistency on palpation

Interpretation

A tense, swollen compartment supports the clinical diagnosis but is non-specific; compartmental firmness alone does not confirm compartment syndrome. This finding, combined with clinical suspicion and pain with passive stretch, should prompt urgent pressure measurement.

⚠ Red Flags

  • •Severe pain out of proportion to clinical examination findings
  • •Pain with passive stretching of muscles in affected compartment
  • •Acute onset following trauma, crush injury, or intensive exercise
  • •Progressive neurological symptoms (paresthesias, numbness, weakness)
  • •Absent or diminishing pulses - a LATE and unreliable sign. Distal pulses are usually PRESENT in acute compartment syndrome, because compartment pressure rarely exceeds systolic arterial pressure. Palpable pulses therefore do NOT exclude the diagnosis. The diagnosis rests on pain out of proportion to the injury and pain on passive stretch of the compartment; waiting for pulselessness means waiting until muscle is already necrotic.
  • •History of rhabdomyolysis or dark urine suggesting myoglobinuria
  • •Signs of systemic toxicity (fever, hypotension, altered consciousness)
  • •Any suspicion of compartment syndrome requires immediate referral to emergency department for compartment pressure measurement and possible surgical fasciotomy

⚡ Yellow Flags

  • •High pain catastrophizing related to fear of permanent disability or limb loss
  • •Anxiety about surgical intervention and recovery timeline
  • •Previous trauma with delayed seeking of medical care
  • •Occupational demands creating pressure to continue activity despite symptoms
  • •Difficulty accepting need for complete activity modification during acute phase
  • •Unrealistic expectations about return to sport or full function timeline

Osteopathic Techniques

Region

Lower leg compartments (anterior, lateral, deep and superficial posterior)

Technique

Soft TissueAI

Rationale

Gentle fascial release and myofascial decompression techniques may provide temporary symptomatic relief in chronic exertional compartment syndrome, but cannot substitute for surgical fasciotomy in acute syndrome. Soft tissue mobilization aims to reduce fascial restrictions and improve tissue extensibility, potentially decreasing compartment pressures in chronic presentations.

Region

Lumbar spine and hip

Technique

ArticulationAI

Rationale

Normalizing lumbar and hip mechanics reduces compensatory lower limb loading that may predispose to compartment syndrome. Restoring normal movement patterns decreases repetitive stress on affected compartments, particularly beneficial in chronic exertional compartment syndrome prevention.

Region

Tibial and fibular articulations

Technique

ArticulationAI

Rationale

Improving tibiofibular joint mobility and reducing rotational restrictions optimizes compartment volume and reduces relative pressure increases during exercise, helping prevent exertional compartment syndrome recurrence.

Region

Lower leg soft tissues and fascia

Technique

FunctionalAI

Rationale

Functional techniques address fascial restrictions and restore optimal segmental mechanics, potentially improving fluid dynamics within compartments and reducing compartment pressure in chronic presentations.

Region

Inguinal and popliteal lymphatic drainage areas

Technique

LymphaticAI

Rationale

Enhancing lymphatic drainage from lower leg reduces tissue fluid accumulation and edema, potentially decreasing compartment pressure and supporting tissue healing in post-operative fasciotomy recovery.

Region

Lumbar plexus and sciatic nerve pathways

Technique

Soft TissueAI

Rationale

Addressing nerve root and peripheral nerve restrictions optimizes neural perfusion and reduces neurological symptoms in chronic presentations, though acute syndrome requires immediate surgical intervention.

Rehabilitation Exercises

Ankle plantar flexion and dorsiflexion (supine, gravity-eliminated)

Range of MotionBeginner

Ankle inversion and eversion (seated, gravity-reduced)

Range of MotionBeginner

Calf muscle stretch (standing wall or step stretch)

StretchingBeginner

Anterior tibialis stretch (kneeling toe-under stretch)

StretchingBeginner

Ankle dorsiflexion with resistance band (seated)

StrengtheningIntermediate

Ankle plantarflexion with resistance band (seated)

StrengtheningIntermediate

Ankle inversion and eversion with resistance band (seated)

StrengtheningIntermediate

Single-leg calf raises (holding support)

StrengtheningIntermediate

Standing balance on affected leg (near wall or support)

BalanceIntermediate

Gait training with normalized stride mechanics

PosturalIntermediate

Stationary cycling (pain-free resistance and duration)

CardiovascularIntermediate

Gradual return to running with interval progression (after clearance)

CardiovascularAdvanced

Referral Criteria

  • •Suspected acute compartment syndrome: IMMEDIATE referral to emergency department for compartment pressure measurement and surgical evaluation
  • •Severe pain disproportionate to clinical findings with risk factors for compartment syndrome
  • •Progressive neurological deficit (weakness, sensory loss) suggesting nerve compression
  • •Signs of systemic toxicity or rhabdomyolysis (myoglobinuria, acute kidney injury)
  • •Chronic exertional compartment syndrome refractory to conservative management: refer to orthopedic surgeon for consideration of fasciotomy
  • •Post-fasciotomy with delayed wound healing, signs of infection, or excessive scar tissue formation: refer to orthopedic surgeon or wound care specialist
  • •Chronic compartment syndrome with significant functional limitation: refer to sports medicine physician or orthopedic specialist for management optimization
  • •Any case where compartment pressure measurement is indicated: requires hospital-based orthopedic evaluation