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Medial tibial stress syndrome

Also called shin splints, MTSS, load-induced medial-leg pain

Exercise pain along the inner edge of the shin bone, often called shin splints. How studies define it, the two accounts of its cause, who it affects, how long it lasts, and what trials comparing approaches found.

Region
Lower leg
Muscles
soleus
Updated
October 22, 2026
Reviewed
October 22, 2026 · how entries are checked

What it is

How studies define it

Pain near the back-inner border of the tibia in running and jumping athletes has had many names2. “Shin splints” and “medial tibial stress syndrome” are the most common2. A 2020 overview article defines the condition as exercise-induced pain along the lower back-inner border of the tibia1. The definition adds recognisable pain when that border is pressed over a length of 5 cm or more1.

One randomised trial in athletes defined its cases by the Yates criteria: exercise-induced pain on that border, diffuse over at least 5 cm when pressed5. They exclude suspected tibial stress fracture and exertional compartment syndrome, a pressure rise inside a closed space of muscle5.

Engraving of the right tibia and fibula seen from the front. The larger tibia on the inner side shows its condyles and tuberosity at the top, the anterior crest and bare medial surface down the shaft, and the medial malleolus at the ankle, with red outlines marking where muscles such as tibialis anterior attach.
Bones of the lower leg from the frontHenry Vandyke Carter, in Henry Gray, Anatomy of the Human Body (1918), Fig. 258. Public domain, via Wikimedia Commons. (source, Public domain)

The authors of a 2025 article proposed renaming it “load-induced medial-leg pain”2. They argued that “tibial stress” is often misread as meaning a bone stress injury (overuse damage to bone)2.

Two accounts of the cause

Two popular theories have been proposed for how it arises: tibial bending and fascial traction3. Its mechanics remain controversial3. A 2015 review describes it as a diffuse periostitis (inflammation of the bone lining) of the tibial surface7. In most cases, the review says, it also involves microtrauma of the cortical bone (the dense outer layer) beneath7. It says it is not clear whether the soft-tissue or the bone reaction comes first7.

Bone bending. One of the two popular theories holds that the condition arises from bending of the tibia3. Studies of bone in athletes with it found:

  • Biopsies, six athletes: bone samples from the painful area showed linear microcracks in four, one an artefact of the biopsy8. There was almost no sign of a repair reaction8.
  • 18 adult male athletes with long-standing symptoms: the painful region had about 15% lower bone mineral density than matched controls9. This density is how much mineral is packed into bone.
  • 14 such athletes, followed for a mean of 5.7 years: density in the painful region rose by about 19% after recovery10.
  • 11 athletes with symptoms for 3 to 10 weeks: tibial bone density was not lower than in 11 regularly exercising controls11.

Traction. One explanation offered for the condition in runners involves three muscles4. These are the tibialis posterior, the soleus and the flexor digitorum longus (the long toe-bending muscle)4. Their repeated contraction would put excessive stress on the tibia4. Studies of cadavers (bodies donated for study) found:

  • Three fresh legs: strain in the fascia where it attaches to the tibia’s inner crest rose steadily as tension on those three tendons increased3.
  • Fifty legs: the soleus, flexor digitorum longus and deep crural fascia most often attached where symptoms occur12. The tibialis posterior did not attach there in any specimen12.
  • Sixteen legs: the three muscles attached above the tibia’s lower third, where the pain is commonly reported13. The authors judged that this did not support muscle-traction theories13. The deep crural fascia attached along the whole inner tibia in all but three legs, which they took as support for traction through it13.

What scans show

A 2009 critical review judged bone, CT and MRI scans of limited value here, because abnormal findings are also prevalent in people without symptoms14.

  • CT, distance runners: cortical abnormalities appeared in 14 of 14 painful tibias of runners with the condition, and in 8 of 48 painless tibias15.
  • Ultrasound, 15 cases and 27 control athletes: bone-lining swelling showed in 53% of cases and 37% of controls, not a significant difference16.
  • MRI, 52 athletes with it: bone marrow or bone-lining oedema (swelling from fluid) showed in 43.5% of the symptomatic legs17.

How it is set against stress fracture

A 1995 MRI study of fourteen runners noted that inner shin pain had traditionally been labelled either shin splints or a stress fracture18. A stress fracture is a small crack in a bone from repeated loading. The authors suggested instead a graded scale: swelling of the bone lining, then growing marrow involvement, then a frank cortical stress fracture18.

In an MRI study of 22 athletes with leg pain, the eight with stress fractures showed a wide bright signal in one area of marrow19. Those with shin splints showed a linear signal along the tibia’s back-inner surface or inner marrow, without the wide signal19.

Who it affects

How common it is

A review article reports an incidence of 4% to 35% in military personnel and athletes14. Single studies and reviews give these figures, where prevalence means the share of a group who have a condition at a given time:

Group studiedWhat was found
Runners, in a systematic review of eight studies (3,500 runners)Prevalence 9.5%; incidence from 13.6% to 20.0%4
933 novice runners, of whom 254 were injuredThe most common injury, at 15% of those injured20
6,608 British Army recruits over 26 weeks of training5.67%, the second most common injury21; 19.8% of recovery days, more than any other injury21

Factors studied

Several meta-analyses, studies that pool the results of earlier studies, have looked for traits linked with developing it22,23.

  • Sex: a meta-analysis of ten papers on runners found female sex significantly associated with it, at a risk ratio of 1.7123. A risk ratio is how many times more often something happens in one group than in another.
  • A previous episode: the runners’ meta-analysis gave a risk ratio of 3.7423.
  • Body weight: two meta-analyses, one in physically active people, found greater body weight or higher body mass index (weight for height) to be risk factors22,24.
  • Arch height: both also found greater navicular drop, how far the inner arch sinks when a person stands22,24. In high school cross-country runners, navicular drop showed no significant association25.

What studies found

How long it lasts

Group studiedTime reported
38 novice runners in a cohort studyMedian (middle value) of 72 days to recover; 97.4% recovered20
Recreational runners injured in a 24-week trialMedian of 70 days from first pain to complete pain relief, against 56 for all injury types26
74 athletes in a randomised trialAverage of 102 to 118 days to complete a graded running programme5
Novice and recreational runners, in a 2020 systematic review of eleven studiesAbout sixteen to eighteen weeks27

The 2020 review warned that the studies’ poor quality stops its figure being solid evidence27. The athletes’ trial was planned on earlier army studies that suggested recovery in about 17 days5. Its authors concluded that 60 to 100 days is likely to be more realistic for athletes5.

Approaches compared in people who have it

Three reviews reached cautious conclusions6,14,28:

  • A 2009 critical review found three randomised studies, in which rest was equal to any intervention tested14.
  • A systematic review of 11 trials judged no intervention free enough of bias to recommend, with shockwave therapy the most promising6. Its pooled trials found no significant difference in outcomes with a lower-leg brace6.
  • A 2026 systematic review of three randomised trials (130 runners) called the evidence for non-invasive approaches limited and mixed, with none clearly superior28.

Single trials tested these additions5,29:

  • Calf exercises or a stocking, 74 athletes: a graded running programme was done alone, with calf stretching and strengthening, or with a sports compression stocking5. Neither time to complete the programme nor satisfaction differed significantly between groups5.
  • Arch supports, 50 female recreational runners: some had arch-support shoe inserts and others flat sham (dummy) ones29. The arch-support group had lower pain scores at 6 and 12 weeks, but not at 1829.

Shockwave therapy

Shockwave therapy sends pulses of sound energy into a painful area through the skin. A 2024 systematic review concluded it may be effective as an addition to exercise in this condition, and called for further high-level research30. Four studies differed:

  • Cohort comparison, 94 people with long-standing symptoms: 47 had it alongside a home training programme, and 47 did the programme alone31. At 15 months, 76% against 37% were rated completely recovered or much improved31.
  • Observational study, 42 athletes at two hospitals: those given five sessions with graded running reached full recovery in a mean of 60 days32. Those at the other hospital, on graded running alone, took 9232. The authors said the finding needs a randomised, double-blind trial32.
  • Randomised trial, 42 military cadets with long-standing symptoms in one leg: one group had one session plus an exercise programme33. At four weeks they ran a mean of 17 min 33 s without symptoms, against 4 min 48 s on exercise alone33.
  • Sham-controlled pilot trial, 28 active adults: a standard dose was no more effective than a sham dose for pain or running distance at 10 weeks34. The authors noted the sham dose may itself have had an effect34.

Trials aimed at new cases

Two reviews differ on shock-absorbing insoles35,36.

  • A 2002 systematic review found four controlled trials among military recruits35. It found no strong support for any method, with the most encouraging evidence for shock-absorbing insoles35.
  • A 2025 meta-analysis of randomised trials found shock-absorbing insoles showed no significant effect, in two studies of 1,571 people36. Insoles for overpronation, the foot rolling too far inward, were associated with fewer cases in four studies of 1,047 people36.

The 2025 review also covered neuromuscular training, exercise aimed at how nerves and muscles work together to control movement36. People given it were less likely to develop the condition, in four studies of 3,887 people36. In a randomised trial of 1,020 soldiers, a 15-minute strength, flexibility and coordination programme did not change the risk against a placebo (dummy) programme37.

Connections

The pain runs along the back-inner border of the tibia22. A systematic review of 17 studies found higher peak soleus activity during push-off among the factors most strongly correlated with developing it38. The review said it is still unknown whether such differences are a cause or an effect38.

The fifty-leg cadaver study bears on the tibialis posterior tendon: its muscle did not attach at the site of symptoms12. For the navicular, one meta-analysis found strong evidence that greater navicular drop is a risk factor, with a small pooled effect39. Limited evidence from two studies in it showed no link with a drop over 10 mm39.

In running, studies pooled by one review put it at 9.1% of injuries, behind patellofemoral pain syndrome at 16.7%40. The stress fracture page covers the 1995 MRI scale of tibial stress injury18.

Medial tibial stress syndrome involves

Medial tibial stress syndrome has studies of muscle activity in

Medial tibial stress syndrome has cadaver studies of

Medial tibial stress syndrome has studies of arch height at

Medial tibial stress syndrome is compared with

Medial tibial stress syndrome is common in

Sources

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Every source the library cites

Changes

  • Links to the new chronic exertional compartment syndrome page
  • First published.