Chronic exertional compartment syndrome (CECS) is exercise-induced pain caused by rising pressure inside the muscle compartments of the lower leg. The muscles are wrapped in a tough, non-stretchy layer called fascia. During exercise, muscles swell, and in CECS the pressure builds enough to cause tightness, aching and sometimes numbness. Symptoms come on predictably at a certain distance or time and settle within minutes of stopping. It is most common in runners, soldiers and athletes in sports like soccer and lacrosse, and often affects both legs.1,2
- Tight, aching or burning lower-leg pain that starts at a predictable point in exercise and eases soon after stopping
- Can cause temporary numbness, tingling or foot weakness (foot slap) during exercise
- Often both legs; usually normal when examined at rest
- Diagnosed by history and, traditionally, by measuring compartment pressures after exercise
- Treated first with activity changes and running gait retraining; surgery (fasciotomy) for persistent symptoms
How it differs from shin splints and stress fractures
Shin splints and stress fractures cause bone tenderness that can linger after running. CECS pain is mostly in the muscle, comes on at a predictable point, and resolves within minutes of rest. The exam at rest is often normal. Nerve entrapment and, rarely, artery entrapment behind the knee can cause similar symptoms and are considered.
Acute compartment syndrome is different
Acute compartment syndrome, usually after a fracture or crush injury, causes severe, constant pain that is out of proportion to the injury and worsens with stretching the toes. It is a surgical emergency. Go to the emergency room if this happens.
Diagnosis
- A detailed history: when symptoms start, where they are and how fast they settle
- An exam at rest and, if possible, after exercise
- X-rays or MRI to rule out stress fractures
- Intracompartmental pressure testing, a needle measurement of compartment pressure before and after exercise, which remains the most commonly used test
Newer non-invasive tests such as MRI and near-infrared spectroscopy look promising but are not yet validated to replace pressure testing.2
Non-surgical treatment
Options include reducing or changing training, cross-training, and running gait retraining, typically shifting to a forefoot or midfoot strike with a shorter, quicker stride. In one case report, a runner who had been offered surgery became symptom-free after a 6-week gait retraining program, with lower compartment pressures.3 Evidence for non-surgical care is limited, and it is most effective in milder cases.1
Surgery: fasciotomy
When symptoms persist and limit sport or work, a fasciotomy releases the tight fascia so the muscles have room to expand. It is done through small incisions. In a 2024 meta-analysis, fasciotomy gave greater pain relief and higher satisfaction than non-surgical care, although return-to-activity results varied between studies. Possible complications include bleeding, nerve irritation and scar problems, and symptoms can recur.1
After surgery, walking starts early, followed by a progressive return to running over several weeks to a few months.
Frequently asked questions
Is exertional compartment syndrome dangerous?
The chronic, exercise-related form is not dangerous in the way acute compartment syndrome is. Symptoms resolve with rest. It can, however, limit sport and training until treated.
Do I need the pressure test?
It is the most widely used test to confirm the diagnosis, especially before surgery. Your history and exam, plus imaging to rule out stress fractures, also matter.
Can changing how I run help?
For some runners, yes. Shifting to a forefoot or midfoot strike with a shorter stride can reduce symptoms. It takes several weeks of guided practice.
How successful is fasciotomy?
Most patients have meaningful pain relief and satisfaction after fasciotomy, but results vary and symptoms can recur in some.
How long is recovery after fasciotomy?
Walking starts within days. Most people return to running gradually over several weeks to a few months.
Research cited on this page
- Elsenosy AM, Elnewishy A, Hassan E, et al. Outcomes of fasciotomy versus conservative management for chronic exertional compartment syndrome: a systematic review and meta-analysis. Cureus. 2024;16(12):e75803. PubMed
Fasciotomy gave greater pain relief and higher patient satisfaction than non-surgical care; return-to-activity results were inconsistent. Complications included hematoma, nerve injury and scar problems. - Ritchie ED, Vogels S, van Dongen TTCF, et al. Systematic review of innovative diagnostic tests for chronic exertional compartment syndrome. Int J Sports Med. 2023;44(1):20-28. PubMed
MRI, near-infrared spectroscopy and SPECT showed promise, but none has been validated well enough to replace compartment pressure measurement. - Allison AK, Ishikawa KL, Gerber JP, et al. Chronic exertional compartment syndrome resolved with running gait retraining: a case report. J Athl Train. 2023;58(4):345-348. PubMed
Case report (a single patient): after 6 weeks of gait retraining, a runner eligible for fasciotomy ran symptom-free with lower compartment pressures, and surgery was no longer recommended.
Medically reviewed by Andrew P. Dold, MD, FAOA, FAAOS, FACS, FRCSC. Last reviewed October 2026. This page is general information, not medical advice. Your own diagnosis and treatment plan depend on your exam and imaging.
