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Muscle Compartment – Anatomy, Function and Compartment Syndrome

A muscle compartment is a connective tissue space enclosed by fascia, containing muscles, blood vessels, and nerves. Increased pressure within it can cause compartment syndrome.

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Things worth knowing about "Muscle Compartment"

A muscle compartment is a connective tissue space enclosed by fascia, containing muscles, blood vessels, and nerves. Increased pressure within it can cause compartment syndrome.

What Is a Muscle Compartment?

A muscle compartment (also called a fascial compartment) is a closed anatomical space in the human body enclosed by a tough layer of connective tissue known as fascia. Within this space, muscles, blood vessels, and nerves run together in a functionally organized unit. Because the fascia has limited elasticity, a rise in pressure within the compartment can compromise blood flow and nerve function, potentially leading to a medical emergency.

Anatomical Structure

The human body contains numerous muscle compartments, particularly in the limbs. Common examples include:

Lower leg (crus): four compartments (anterior, lateral, deep posterior, superficial posterior)
Thigh: three compartments (anterior, posterior, medial)
Forearm: two compartments (flexor and extensor sides)
Foot and hand: several smaller compartments

Each compartment contains a defined group of functionally related muscles along with their associated blood vessels and nerves.

Function of the Muscle Compartment

The fascial envelope of a muscle compartment serves several important roles:

It maintains muscles and neurovascular structures in their correct anatomical positions.
It allows low-friction gliding movement between adjacent muscle groups.
It transmits mechanical forces and supports coordinated movement.
It acts as a barrier against the spread of infection and tumors.

Clinical Relevance: Compartment Syndrome

The most important clinical concern related to muscle compartments is compartment syndrome – a dangerous rise in pressure within a compartment that impairs circulation and nerve function.

Causes

Fractures (especially tibial fractures)
Crush injuries and high-energy trauma
Burns with associated swelling
Tight bandages or plaster casts
Reperfusion injury following vascular occlusion
Excessive physical exertion (chronic exertional compartment syndrome)

Symptoms

Severe pain, often disproportionate to the injury
Feeling of tightness and hardness in the affected area
Tingling or numbness (sensory disturbances)
Muscle weakness or paralysis
Pale, cool, or cyanotic skin (in advanced stages)

Diagnosis

Diagnosis is primarily clinical and confirmed by intracompartmental pressure measurement. A compartment pressure above 30 mmHg, or a delta pressure (diastolic blood pressure minus compartment pressure) below 30 mmHg, is considered critical and requires immediate intervention.

Treatment

Acute compartment syndrome is a surgical emergency. The only effective treatment is immediate fasciotomy – a procedure in which the fascia is surgically incised to relieve pressure and restore blood flow. Without timely treatment, irreversible muscle and nerve damage or even loss of the limb can occur.

References

Olson SA, Glasgow RR. Acute Compartment Syndrome in Lower Extremity Musculoskeletal Trauma. Journal of the American Academy of Orthopaedic Surgeons, 2005;13(7):436-444.
Duckworth AD, McQueen MM. The Diagnosis of Acute Compartment Syndrome: A Critical Analysis Review. JBJS Reviews, 2017;5(1):e1.
World Health Organization (WHO) – Emergency Surgical Care Guidelines, Compartment Syndrome Management (2023)

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