Muscles sit in compartments wrapped in tough fascia that does not stretch. When swelling raises the pressure inside one, it squeezes shut the vessels feeding the muscle within it. The muscle then dies, quietly, inside an apparently intact limb.
Compartment syndrome is a surgical emergency in which pressure inside a muscle compartment rises until it cuts off the compartment's own blood supply. The classic warning is pain out of proportion to the injury, worse on passively stretching the muscles. Treatment is fasciotomy: opening the fascia along the length of every affected compartment. Delay of even a few hours costs muscle and nerve permanently.
The muscles of the leg and forearm are divided into compartments, each wrapped in fascia that is strong and essentially inelastic. That works well until something inside swells: a fracture bleeding, muscle swelling after blood flow is restored, a crush injury, a tight plaster or a burn eschar.
Pressure inside the compartment rises. The small vessels supplying the muscle are the first to be compressed, long before the main artery running through the limb. This is the point that is most often missed: the foot can still be pink with a palpable pulse while the muscle in the calf is dying.
Because of that, the diagnosis rests on symptoms rather than pulses. Pain out of proportion to the injury is the earliest and most reliable sign, and pain on passively stretching the muscles of that compartment is the classic test. Numbness follows, then weakness. By the time the limb is pale and pulseless, irreversible damage has usually been done.
The only treatment is to open the fascia, along the full length of the compartment, releasing every compartment involved. Partial or short releases do not work. The wounds are deliberately left open and closed or grafted days later once the swelling has settled.
Where the diagnosis is genuinely suspected, release is done. Waiting for certainty is how limbs are lost.
Assessment is clinical: pain, pain on passive stretch, tense compartments. Pressure measurement is used where the patient cannot report symptoms.
Long incisions open the fascia over the full length of each compartment. In the calf all four are released, usually through two incisions.
Muscle is inspected for colour, bleeding and contraction. Clearly dead muscle is removed.
The skin is not closed. Closing it would recreate the pressure the operation was performed to relieve.
Over the following days the swelling settles and the wounds are gradually closed, or skin grafted where they cannot be brought together.
Wounds dressed and inspected. Further debridement if muscle has died. Kidney function monitored where there was significant muscle damage.
Wounds closed progressively or skin grafted. Physiotherapy begins early to limit stiffness.
Grafts and wounds heal. Splinting maintains position. The extent of nerve recovery becomes clearer.
Nerve recovery continues for a year or more. Secondary surgery for contracture or tendon transfer is considered once things have settled.
Released early, the muscle and nerve usually recover well and the main legacy is the scars from the fasciotomy wounds. Released late, the muscle that has already died is replaced by scar, which contracts and pulls the limb into a fixed deformity, and the nerve damage is often permanent. That difference is measured in hours. The fasciotomy wounds themselves are long, frequently need skin grafting, and leave substantial scars. Those scars are the price of keeping the limb and are not a complication.
The risks of releasing are modest. The risk of not releasing is losing the limb, which frames the whole discussion.
The wounds are managed in stages, and movement is started early to limit stiffness.
The small vessels within the compartment are compressed long before the main artery. Many limbs lost to compartment syndrome had a palpable pulse throughout.
Muscle dies within hours. This is one of the few genuinely time critical operations in limb surgery, and delay changes the outcome permanently.
Closing the skin recreates the pressure the operation was done to relieve. The wounds are left open and closed in stages once swelling settles.
Long fasciotomy scars are the sign of an adequate release. Short, tidy incisions in this operation are a warning sign, not a good result.
Fasciotomy wounds are large, and the difficulty afterwards is closing them without a long delay or a poor result. Having reconstruction available from the same team means the wounds are planned for at the moment they are made.
Emergency fasciotomy and the reconstruction that follows are commonly covered by health insurance and by government schemes including PM JAY. Treatment is never delayed for financial arrangements.
Mostly asked after the event, about the scars and about why it was so urgent.
Ask your question →Because the fascia has to be opened along the entire length of the compartment. A short incision releases only part of it and the pressure stays high in the rest. Long scars are the sign of an adequate operation here.
Closing the skin would put the pressure straight back. The wounds are left open until the swelling settles, then closed gradually or skin grafted over the following days.
The pressure inside a compartment closes the small vessels feeding the muscle well before it is high enough to stop flow in the main artery. Relying on pulses is the commonest way this diagnosis is missed.
If the release was early, usually yes, and the main legacy is the scars. If it was delayed, the muscle that died is replaced by scar which contracts, and both weakness and deformity can be permanent.
Once a compartment has been released it cannot build the same pressure again, so recurrence in that compartment is not the concern. The concern after the event is stiffness, contracture and nerve recovery.
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