Dr. Yi-Cheng Wu
中文

Runner's Notes: Reducing and Preventing Medial Tibial Stress Syndrome (MTSS)

By Dr. Yi-Cheng Wu · Reviewed June 21, 2026

Medial tibial stress syndrome (shin splints) is a common overuse injury in runners, with pain along the posteromedial border of the middle-to-lower shin.

Medial tibial stress syndrome (MTSS, commonly called shin splints) is an overuse injury with pain along the posteromedial border of the middle-to-lower third of the shin, often linked to a sudden increase in running volume or intensity or switching to harder surfaces. It is common in runners and military recruits, and being female, higher body weight, flat feet, overpronation, and a previous running injury are higher-risk factors. It is diagnosed mainly from the history and physical examination (tenderness on palpation along the medial tibia), with imaging used when needed to rule out a stress fracture. Management centers on rest or reduced load, short-term icing and anti-inflammatory drugs in the acute phase, along with insoles and a gradual return to training. If pain persists, does not ease with rest, or appears as soon as you start exercising, medical evaluation is advisable.

Medial tibial stress syndrome (MTSS) is usually an overuse injury. It shows up as pain along the posteromedial border of the middle-to-lower third of the shin during exercise. The exact pathophysiology is not fully understood, but it is thought to result from traction on the periosteum and repetitive loading.

Synonyms include shin splints, tibialis posterior myofasciitis, and soleus syndrome.

Epidemiology

  • The incidence in runners is 13.6%-20%

  • In military recruits, the incidence is 5.7-25%, making it the second most common musculoskeletal injury

Primary prevention

Methods include

  • Shock-absorbing insoles: the most studied
  • If flat feet are present, consider insoles that reduce foot pronation
  • Replace running shoes after every 300 to 600 miles
  • Increase the running program gradually

Risk factors

  • Overtraining of the lower limb is the most important factor; four other higher-risk factors are

  • Female sex: associated with a 1.5-3.5 times higher risk of progressing to a stress fracture

  • Higher body weight

  • Flat feet, a dropped arch (navicular drop, a marker of overpronation)

  • A previous running injury

Other risk factors include:

  • Limited hip external/internal rotation
  • Limited ankle range of motion
  • Higher body mass index (BMI)
  • Poor overall physical condition
  • Weak core strength
  • Running more than 20 miles per week

History

  • Usually gradual in onset
  • Associated with a sudden increase in activity intensity/duration, or a change from a softer surface to a harder one such as concrete
  • Early in the course: pain during exercise, rather than as soon as exercise begins
  • Sometimes eases while activity continues
  • Usually worse on push-off
  • Typically feels sore after rest, which differs from the pain of chronic exertional compartment syndrome that resolves quickly with rest
  • Later in the disease: pain throughout the activity
  • Pain and soreness persist after exercise stops

Physical examination

  • Shin Palpation Test (SPT): tenderness on palpation along the medial border of the middle-to-lower two-thirds of the shin

  • Shin Oedema Test (SOT): apply sustained pressure (hold for 5 seconds) over the lower two-thirds of the medial tibia bilaterally, and record any pitting edema

  • The most sensitive finding is diffuse posteromedial pain on palpation

  • Lower-limb kinetic chain examination may reveal overpronation, navicular drop or other foot malalignment, and core muscle weakness and instability

  • Chronic thickening, soft-tissue swelling, or nodules

  • Shoe examination shows an overpronation wear pattern and excessively worn shoes

  • The posterior compartment does NOT have symptoms such as cramping, burning pain, and/or numbness/tingling of the foot

Differential diagnosis

  • Stress fracture
  • Compartment syndrome: involves both limbs, eases with rest, and may be accompanied by additional symptoms such as paresthesia, pallor, decreased skin temperature, and loss of distal pulses in the lower limb
  • Muscle strain
  • Nerve entrapment
  • Fascial defects
  • Popliteal artery entrapment syndrome
  • Effort-induced venous thrombosis

Diagnostic tools

  • Mainly a clinical diagnosis, based on the history and physical examination, but other possible causes need to be ruled out; imaging is used to assess other conditions, such as a stress fracture

X-ray

  • Usually normal in the first 2-3 weeks (as it is in patients with early stress fracture)
  • Long-term changes include periosteal new bone formation, which distinguishes it from a stress fracture, where the latter shows the “dreaded black line”
  • Bone scan
  • Imaging shows increased uptake along the posteromedial border of the tibia in the delayed phase; it involves radiation and is a reasonable test
  • Sensitivity 74-84%, lower in specificity and sensitivity than MRI

Ultrasound

  • Localized hyperechoic periosteal elevation around the distal tibia
  • Doppler scan shows irregular increased blood flow

Computed tomography (CT)

  • Shows osteopenia of the posteromedial tibial cortex
  • Sensitivity 42-100%, specificity 82-100%; like a bone scan it involves radiation, and its sensitivity is lower than a bone scan
  • May be useful when the clinical diagnosis is unclear, though MRI is usually preferred

Magnetic resonance imaging (MRI)

  • Can show bone marrow edema and periosteal edema signal, with no radiation
  • The most sensitive radiological test for medial tibial stress syndrome. It can show everything from normal findings to medial tibial stress syndrome with periosteal fluid and bone marrow edema, and can even detect a stress fracture, with the highest sensitivity and specificity

Initial treatment

  • In the acute phase, short-term use of non-steroidal anti-inflammatory drugs (NSAIDs) and icing is most helpful

  • Rest completely if possible, or modify exercise intensity: reduce running distance, frequency, and intensity by 50%

  • Research supports that extracorporeal shockwave therapy (ESWT) may be effective

  • Braces are not recommended, and surgery is rarely needed

Additional treatment

  • Appropriate taping may improve symptoms; strengthen the invertor and evertor muscles of the calf

  • For patients with flat feet (pes planus), consider more supportive shoes or insoles

  • For patients with high arches (pes cavus), consider adding cushioning in the shoes or using shock-absorbing insoles

  • Consider changing to a new pair of shoes every 3 to 6 months, at about 200 to 300 miles (320 km to 480 km)

Surgery

  • For recurrent cases, the following procedures may be considered
    • Surgical release of the soleus fascia along the medial border of the tibia; although medial tibial stress syndrome is not a compartment syndrome, releasing this fascia can help relieve pain
    • Detaching the soleus attachment on the periosteum can relieve the associated periostitis
    • Cautery of the medial tibial periosteum, allowing the periosteum to heal and reattach

Follow-up

  • Change training technique, add rest days, and include cross-training days with non-weight-bearing activities such as swimming and cycling

  • Increase training intensity/duration slowly, by no more than 10% per week

  • Most patients recover within a few weeks after early and active rehabilitation; not following the treatment plan may lead to 3 to 4 months of being unable to return to sport

References

Frequently asked questions

Are shin splints and medial tibial stress syndrome the same condition?

Yes. The synonyms for medial tibial stress syndrome (MTSS) include shin splints, tibialis posterior myofasciitis, and soleus syndrome, all referring to an overuse injury with pain along the posteromedial border of the middle-to-lower shin from repetitive loading.

Which runners are more likely to develop shin splints?

Overtraining of the lower limb is the most important factor. The article also lists being female (associated with roughly a 1.5 to 3.5 times higher risk of progressing to a stress fracture), higher body weight, flat feet or a dropped arch, a previous running injury, and running more than 20 miles per week as higher-risk factors.

How can I reduce or prevent shin splints?

The prevention measures mentioned in the article include shock-absorbing insoles (the most studied), insoles that reduce foot pronation for people with flat feet, replacing running shoes every 300 to 600 miles, and increasing your running program gradually while avoiding sudden spikes in training volume.

Do shin splints need an X-ray or MRI?

MTSS is mainly a clinical diagnosis based on the history and physical examination. Imaging is mostly used to rule out other causes such as a stress fracture. X-rays are often normal early on, while MRI is the most sensitive test, showing periosteal and bone marrow edema; whether to arrange imaging still depends on a physician's individual assessment.

How long does it usually take to get back to running after shin splints?

The article notes that most patients recover within a few weeks with early and active rehabilitation, but not following the treatment plan may lead to about 3 to 4 months of being unable to return to sport. When returning to training, a weekly increase of no more than 10% is suggested, along with rest days and cross-training.

This article is also available in the original Chinese, with the full reference list.

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