Compartment Syndrome

Overview

Compartment syndrome is a serious problem where pressure builds up inside a tight space in your body. Your arms and legs are divided into sections called compartments. Each one holds muscle, nerves, and blood vessels, all wrapped up in a tough, firm layer of tissue called fascia. This wrapping doesn't stretch much. If extra fluid or blood collects inside — usually after an injury — the pressure rises. The pressure squeezes the blood vessels and nerves like a hand closing around a hose. Blood can't flow properly, so muscles and nerves don't get the oxygen they need. There are two main types. Acute compartment syndrome happens suddenly after an injury and is a medical emergency. Chronic (or exertional) compartment syndrome happens during exercise, usually in the legs, and eases with rest.

Acute compartment syndrome is uncommon, but it is serious, and doctors are trained to watch for it whenever someone has a broken bone or a bad injury. Chronic exertional compartment syndrome is more common in people who do a lot of repetitive exercise, like runners, cyclists, and military recruits.

Anyone can get it, at any age. Acute compartment syndrome is seen most often in younger adults after a fracture, and it can also happen in children — sometimes with no cast at all. Chronic exertional compartment syndrome usually affects active people who train hard, especially in their 20s and 30s. Older adults can also be affected, particularly after a fall or a fracture, and their symptoms can be easier to miss.

Symptoms

Common symptoms

• Pain that is much worse than you would expect from the injury — often described as severe, deep, and burning
• Pain that gets worse when you stretch or move the fingers or toes on that limb
• A limb that feels very tight, hard, or swollen to touch
• Pins and needles, numbness, or a 'dead' feeling in the limb
• Weakness, or trouble moving the fingers or toes normally
• Skin that looks pale, shiny, cold, or slightly blue
• Pain that doesn't get better with painkillers, rest, or raising the limb
• For the chronic type: aching, tightness, or cramping in the lower leg during exercise that goes away within minutes of stopping

Symptoms in children

• Crying that won't settle, or pain that seems out of keeping with the injury
• Not wanting the limb touched, moved, or handled
• Being reluctant to use an arm or leg, or to bear weight
• Increasing swelling, or a cast that suddenly feels very tight
• Irritability, sleepiness, or seeming 'not themselves'
• Note: some of the classic warning signs are less reliable in children, so trust your instincts and seek help early

Symptoms in older adults

• Pain after a fall or fracture that seems worse than expected
• Symptoms that are blamed on the cast or splint feeling uncomfortable
• Reduced sensation from other conditions (such as diabetes) hiding early nerve signs
• Bruising or swelling that keeps growing, especially if you take blood-thinning medicine
• Confusion or feeling generally unwell in a severe case

Causes

Main causes

• A broken bone, especially in the lower leg (shin bone) or forearm
• A crush injury, heavy blow, or bad bruise with bleeding inside the limb
• A cast, splint, or tight bandage that presses on the limb, especially as swelling increases
• Burns, or surgery to the limb
• Bleeding inside the limb — for example after a fall in someone taking blood-thinning medicine
• Lying on a limb for a long time without moving it, such as after drinking heavily or taking drugs
• Blood flow suddenly returning to a limb that had been without it
• Repeated heavy exercise — the cause of the chronic (exertional) type

Risk factors

• A recent fracture, especially of the shin bone or forearm
• High-energy injuries, such as road traffic crashes or sports injuries
• Taking blood-thinning medicine, or having a bleeding disorder
• Having a tight cast, splint, or bandage fitted
• Being young with well-developed muscle, which leaves less room for swelling
• Being unable to move or feel a limb normally, for example after nerve damage or a long period of unconsciousness
• Doing a lot of repetitive high-impact exercise, such as long-distance running

When to see a doctor

See a doctor urgently if:

• You have pain that is much worse than your injury suggests it should be
• Your pain is getting worse instead of better, or isn't helped by the pain relief you were advised to take
• You notice new numbness, tingling, weakness, or a change in colour in the limb
• Your cast or splint feels too tight, or your fingers or toes look swollen
• You have had a sling, cast, or bandage fitted and something doesn't feel right

Book a routine appointment if:

• You get aching or tightness in your legs during exercise that settles quickly with rest
• You find you have to stop and rest during runs or training because of leg pain
• You are recovering from compartment syndrome and want advice on getting back to normal activity
• You have ongoing weakness, numbness, or scarring after treatment

Diagnosis

For the acute type, a doctor usually makes the diagnosis by examining you and asking about your pain. They will look at how swollen and tight the limb is, check the pulses, test feeling and movement in your fingers or toes, and gently stretch the muscles to see if that hurts. Your description of the pain matters a lot, so be honest about how bad it is. If there is any doubt, they may measure the pressure inside the compartment using a small needle. For the chronic type, the doctor will ask about your exercise patterns and may arrange tests, often after you have exercised.

Tests that may be done

• A physical examination of the limb, including checking pulses, feeling, and movement
• Pressure measurement: a small needle is placed into the compartment to read the pressure inside
• X-rays or a scan to check for a fracture or other injury
• Blood tests to check for muscle damage
• A urine test in severe cases, to check for muscle breakdown products
• For the chronic type: exercise testing, imaging before and after exercise, or a pressure reading taken during or just after exercise

What to expect at your appointment

If compartment syndrome is suspected, things move quickly. You may be seen in an emergency department, and staff will check your limb often to see whether anything is changing. Pressure measurement involves a small needle — it stings briefly but is over quickly. If the pressure is high, or the doctor is very concerned, you will be referred straight away for treatment rather than waiting for more tests. For the chronic type, the process is slower and calmer, with tests arranged over a few weeks.

Treatment

Acute compartment syndrome is treated as an emergency. The goal is to relieve the pressure quickly so that muscle and nerve are not damaged. Chronic exertional compartment syndrome is managed differently, usually by changing how you train before considering surgery.

Self-care at home

• Follow the care advice you were given for your cast or splint, and never wrap a bandage tighter than you were shown
• Keep the limb at the level you were advised — after treatment for acute compartment syndrome, staff often say to keep it level with your heart rather than raised high
• Take pain relief exactly as your healthcare team advises, and tell them if it isn't working
• Keep any surgical wound or scar clean and dry as instructed
• Do the gentle movement and stretching exercises your physiotherapist gives you, and build up slowly
• For the chronic type, keep a simple diary of when pain starts and stops during exercise — it helps you and your clinician spot patterns
• Avoid smoking, as it slows healing and blood flow — ask your GP or pharmacist for help if you want to stop

Medical treatments

In the acute situation, the first steps are to remove anything tight — a cast, splint, or bandage is cut open so the limb has room to swell. You will be given strong pain relief and fluids through a drip, and your limb and urine output will be monitored closely. If the pressure stays high, urgent surgery is needed. After surgery, the wound is looked after carefully, and physiotherapy starts as soon as it is safe. For chronic exertional compartment syndrome, treatment usually starts with changes to training, physiotherapy, and sometimes footwear or running-style advice; if that doesn't help enough, surgery may be discussed.

When is surgery considered?

Surgery is the main treatment for acute compartment syndrome. It is called a fasciotomy: the surgeon makes a cut through the tight fascia to let the pressure out. Sometimes the wound is left open for a day or two and then closed, or covered with a small skin graft later. This operation is done as an emergency, often the same day. For chronic exertional compartment syndrome, surgery is only considered if other approaches haven't worked and the pain is really affecting your life — it involves releasing the tight tissue, and you would need a full discussion with a specialist about the benefits and risks.

Living with this condition

Recovery after acute compartment syndrome takes time — often weeks to a few months. At first you may need help with everyday tasks, and you may have a wound, a scar, or a cast to look after. You might notice some weakness, numbness, or stiffness in the limb; physiotherapy helps a lot with this. Build your activity up gradually and set small goals rather than aiming to be back to normal straight away. If you have the chronic type, you may need to change your training or switch sports, which can take some adjusting to.

Lifestyle tips

• Build activity back up in small steps, with guidance from your physiotherapist
• Keep to a regular routine of stretching and strengthening exercises
• Look after your scar — keep it moisturised and protect it from the sun once it has healed
• Choose supportive, well-fitting footwear if you exercise
• Avoid sudden big increases in training time or intensity
• Eat a balanced diet and stay well hydrated, which helps your body repair and recover
• Get enough sleep, as this is when your body does much of its healing

Diet and exercise

There is no special diet for compartment syndrome, but eating a varied, balanced diet and drinking enough water supports healing. Once you are healing, gentle movement is helpful — a physiotherapist can guide you on what is safe at each stage. Avoid vigorous exercise on a limb that is still healing until you are told it is safe. If you have chronic exertional compartment syndrome, your clinician or physiotherapist can help you plan training that keeps you active while reducing the chance of triggering pain.

Mental health and emotional wellbeing

It is very normal to feel shaken after an emergency like this. Many people feel anxious about the limb, worry about the scar, or feel frustrated by how long recovery takes. Some people have flashbacks or low mood after a frightening injury. These feelings usually ease with time and support, but if they are affecting your sleep, appetite, or daily life, please tell your GP or practice nurse. If you ever feel you are in crisis or having thoughts of harming yourself, contact your local crisis line or your local emergency number straight away — you deserve help urgently, and you will not be judged.

Prevention

You can't prevent every case, but you can lower the risk and make sure problems are caught early. If you have a cast, splint, or bandage, ask exactly what warning signs to look out for and who to contact if you are worried. Keep your limb at the level you were advised to, and never tighten a bandage yourself. Go back if the cast feels too tight or your pain is getting worse. If you do a lot of repetitive exercise, increase your training gradually, use good footwear, and don't ignore leg pain that keeps coming back at the same point in your workouts. If you take blood-thinning medicine, tell any clinician treating you for an injury.

Screening programmes

There is no general screening programme for compartment syndrome. Instead, healthcare staff are trained to check for it — often repeatedly — whenever someone has a broken bone, a crush injury, or a new cast. That is why staff may come back to check your limb several times; each check matters.

Complications

If left untreated

• Permanent damage to muscles, which can leave lasting weakness
• Nerve damage causing numbness, tingling, or loss of movement in the limb
• A clawed or stiff hand or foot from muscle and nerve damage (sometimes called a contracture)
• In very severe cases, loss of the limb
• Muscle breakdown products getting into the bloodstream, which can strain the kidneys
• A serious whole-body illness, which is rare but life-threatening if treatment is delayed

Long-term outlook

The outlook is good for most people who are treated quickly. Many make a full or near-full recovery, especially when the pressure is released early and physiotherapy is started soon afterwards. Some people are left with weakness, numbness, or a visible scar, and recovery can take months rather than weeks. Chronic exertional compartment syndrome is usually manageable with changes to training, and surgery helps many people get back to their sport. Whatever your situation, the aim is to keep you moving, comfortable, and supported — your healthcare team will work with you on the next steps.

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