SHIN SPLINTS THE 5 W's

Medial tibial stress syndrome affects up to half of military recruits in basic training. What causes it, how to tell it apart from a stress fracture, and the rehab and return-to-running plan that holds up under scrutiny.

Shin splints are a training load/volume problem. Almost everything else is a bit of an afterthought no matter what someone is trying to sell you.

The pattern barely changes. Eight weeks out from a course, the running goes up, the tabs get longer, and the boots come out of the cupboard. Week two, the inside edge of the shin aches for the first ten minutes of a run and then settles, so it gets ignored. Week three it aches for the whole run. Week four it hurts going down the stairs.

Then one of two things happens. Some people stop dead for a fortnight, feel fine, go straight back to the volume that caused it and have it again inside a week. Others push on, because everyone gets shin splints, and turn a manageable irritation into a bone stress injury or a compartment issue that costs them the course.

We get this in consultations constantly. It's the most common single complaint in the final block before a course, and it's one that is fairly avoidable.

Years of assessing this in person taught me one thing above all the rest. The shin is not the interesting part of the assessment...it's just the symptom. The training diary is more important.

The five Ws of shin area injuries:

• Who. People putting repeated stress through the structures of the lower leg. Runners, dancers, recruits, selection candidates.

• What. Pain, inflammation and tenderness along the shin, worse with impact.

• Where. The lower leg, along the inside edge of the tibia, sometimes the front edge instead.

• When. Typically two to six weeks after training volume steps up.

• Why. Overload. The tissue was asked for more than it had the capacity to give, faster than it could adapt.

This article covers what medial tibial stress syndrome actually is, how common it is in military populations, what raises your risk, how to tell it apart from the conditions that mimic it, what the treatment evidence supports, and a graded return to running you can follow session by session.

What are shin splints, and where do you feel them?

Shin splints is a colloquial term. The clinical name is medial tibial stress syndrome, or MTSS.

Winters and colleagues (2018) define it as pain along the posteromedial border of the tibia occurring during exercise, or pain on palpation over an area of 5cm or more along that border.

That 5cm threshold is important too because, in a clinical assessment, it's the main thing separating MTSS from a stress fracture and a 6 week gradual recovery from a 12-24 week complete reset of your training.

You can get the same picture on the front edge of the shin, which is anterior tibial stress syndrome. Different location, same mechanism, same management.

What's happening underneath is still argued over. Two theories dominate. The first is traction: the tibialis posterior, soleus and flexor digitorum longus pull on the periosteum through Sharpey's fibres, and repeated pull irritates it. The second is bone: the tibia bends fractionally under repeated impact and responds with a stress reaction because it can't remodel fast enough to keep up.

Histology hasn't settled the argument but it doesn't really need settling to avoid it and heal from it. Both are load stories. Something asked the tibia and the tissues attached to it for more work than they were built for, and asked faster than they could adapt.

Which is why the treatments aimed at tissue rather than load keep disappointing. Massage doesn't change tibial bending moments. Neither does a calf stretch.

How common are shin splints in military training?

Common enough to distort the injury statistics of an entire intake.

In runners, MTSS incidence sits somewhere between 13% and 17%, and it's the most frequently reported running injury there is (Menendez et al., 2020).

In military recruits the numbers are far higher. A recent narrative review reports incidence of 50 to 56% in recruit populations, symptoms typically appearing two to three months into training, and MTSS accounting for just under 20% of all rehabilitation days (Alrabai, 2024). Women are affected at roughly twice the rate of men, which is best explained by smaller tibial cross-sectional area and training background rather than anything about how they train.

The strongest single predictor in that population isn't biomechanical. Recruits arriving with low aerobic fitness were 3.6 times more likely to develop MTSS.

Worth keeping in mind if the plan is to turn up underprepared and get fit on the course. The underprepared don't simply perform worse. They get injured at several times the rate, and then they perform worse and blame it on something other than themselves.

What raises your risk?

Table 1. Risk factors for medial tibial stress syndrome and what each one is worth in practice. Only one of them is under your control on a daily basis.

Most of that list isn't modifiable. You can't change tibial geometry or sex, and pronation is a weak lever at best. The rate at which you add load is under your control every single day, and it carries the largest effect of anything on the table. That's where the effort goes.

Is it shin splints, or is it something worse?

The label kinda gets slapped on any issue or ache below the knee. Some of those aches are a different problem entirely, with a different answer, and one of them may need a surgeon rather than a coach.

Table 2. The differential diagnosis for exertional shin pain.

Two points to refresh from the last article:

1 - Neglected shin splints do not turn into compartment syndrome. Chronic exertional compartment syndrome is a separate condition with a separate mechanism, pressure rising inside a fascial compartment during exercise, and ignoring MTSS doesn't cause it. What ignoring MTSS does do is push you further along the bone stress continuum towards a tibial stress fracture. That's the progression to worry about.

2 - A bone stress injury doesn't mean six weeks of bed rest. It means 'relative' rest. You offload the tibia and keep training everything else. Bed rest costs aerobic fitness, muscle and bone density, all of which then have to be rebuilt before you're fit to run, which makes the whole thing longer.

Get it assessed properly if any of the following apply: pain sharp and localised to a spot you can cover with two fingers, pain arriving earlier in each session rather than later, pain that persists at rest or wakes you at night, pain on hopping on that leg, or any numbness, pins and needles or weakness. The anterior cortex of the tibia is a high-risk site and behaves differently from the posteromedial border. Don't self-manage that one - get it seen to asap.

Does carrying weight make shin splints worse?

Yes, and it's the part that running-focused advice misses entirely for our community.

Mass on your back raises the load going through the tibia at every step. A 2025 study measured tibial bending moments in people walking at a fixed speed carrying nothing, 15kg and 30kg, in trainers and in military boots (Han et al., 2025). In trainers, loading in that area climbed with every increment of weight. In boots, it climbed from 0 to 15kg and then changed little between 15kg and 30kg, which the authors put down to the boot absorbing more energy at the ankle.

One study, and not a reason to change your footwear. It is a reason to treat tabbing as a tibial stressor in its own right rather than filing it under cardio (check out our Tabbing without injury article)

The practical problem is that running volume and tab volume almost always rise in the same block, for the same reason, in the same eight weeks. Two separate stressors landing on one bone. Consolidate them or stagger them, but the total is what the tibia feels and has to adapt to either way.

When shins start complaining, cut the highest-impact, highest-frequency stressor first. That's usually running, and specifically downhill running, which produces the largest impact loads of anything in a tactical programme.

How do you prevent shin splints?

Six principles that will help out, in a rough order of how much they matter.

• Control the rate of change. Progress one variable at a time, and give the new load two to three weeks before you add to it again. The 10% rule is a useful rule of thumb rather than a law, and the return-to-running literature is clear that individual tolerance varies widely (George et al., 2024). The principle underneath it holds regardless: bone adapts slower than the engine does.

• Build the aerobic base before the running volume. Low entry fitness is the biggest predictor in recruits. Cycling, rowing and swimming all build the engine without loading the tibia, so there's no excuse for arriving underprepared and then trying to catch up with mileage.

• Build calf capacity. The calf complex absorbs ground reaction force before the tibia sees it, and it's almost always the weak link. Calf raises, straight knee and bent knee, 3-5 sets of 8-20 reps, two or three times a week, loaded once bodyweight is easy.

• Feed the bone. Lappe and colleagues (2008) gave 2,000mg calcium and 800 IU vitamin D daily to female Navy recruits through eight weeks of basic training. Stress fracture incidence fell 20% against placebo, across 5,201 participants. That's one of the cleanest prevention findings in the whole field.

• Try shock-absorbing insoles. (not my go to but worth mentioning) Prefabricated insoles carry some of the better prevention evidence in recruit populations. Low cost, low risk, worth a go but don't use it as a crutch. You should still be working on your strength and aerobic capacity as the main thing that will prevent MTSS.

• Get gait retraining if you can access it properly. Sharma and colleagues (2014) screened 450 British Army recruits, identified 166 as at risk on plantar pressure measurement, and randomised them to a gait retraining programme or standard training. The adjusted hazard ratio was 0.25, with a number needed to treat of 14 over 20 weeks. That's the strongest prevention result in this literature.

A word on cadence, because it'll get lumped into recommendations for shin pain constantly. Anderson and colleagues (2022) pooled the step rate literature and found moderate evidence of no change in peak tibial acceleration when runners increased step rate by around 10%, and no meaningful change in vertical loading rates.

What it does reduce is peak knee extensor moment and hip adduction. So it's a reasonable intervention for a knee and an unproven one for a tibia. If someone tells you a metronome will fix your shins, they're extrapolating from the wrong joint and usually full of shit.

What actually works for treating shin splints?

Less than the internet and social media coaches claim, and two studies that matter are worth knowing in detail.

Winters and colleagues (2013) reviewed the treatment literature and found eleven trials, none of them methodologically clean enough to recommend the treatment it tested. Iontophoresis, phonophoresis, ice massage, ultrasound, periosteal pecking and shockwave therapy all showed something against control, with shockwave the most promising. Low-level laser, cupping, needling, stretching and strengthening in isolation, compression stockings and leg braces showed nothing.

The more useful study is Moen and colleagues (2012). They took athletes with MTSS, put all of them on the same graded running programme, then randomised them to add stretching and strengthening, add compression stockings, or add nothing at all. Mean time to complete the programme was 105 days for running alone, 118 days with the exercises and 102 days with the stockings. No significant difference between any of them.

It doesn't say strength work is pointless. It says strength work isn't an analgesic and won't shorten this episode. The graded running programme is the treatment. Everything else is a comfort measure and a training capacity investment that pays out on the next block rather than this one.

Table 3. What the treatment literature supports. The unglamorous option is the one that works as always.

The rehab: what to actually do

Two plans run in parallel.

1 - Reduce the load so the tibia stops being irritated

2 - Raise capacity so the same load doesn't irritate it next time.

A big 'rule' for the first point: day-to-day activity should be pain free. If walking or stairs hurt, running volume is still too high. No exceptions, no negotiation.

For the second point, this is some of the work needed:

• Calf raises. Straight knee and bent knee, standing and seated, staggered too. 3-5 sets of 6-20 reps, two or three times a week. Load them once bodyweight is easy. This is the highest-value exercise on the list.

• Intrinsic foot work. Short foot drills, toe taps, toe raises, toe spreading. Ten minutes a week is enough to matter. It improves the foot's ability to absorb ground reaction force before it travels into the shin.

• Tibialis anterior raises. Worth including but not a panacea for all issues from ankles to knees. They can offer some protection against anterior shin pain and the overload that comes with descents under weight, though the benefits get overstated online.

• Monster walks. Heel walking, then walking in the highest tiptoe position, then with the ankle in inversion and eversion. 30 seconds of each, rest, repeat for a few sets. Cheap and effective for the medial and lateral ankle.

• Split squats, front foot elevated. Progressive ankle and lower leg loading with a single-leg strength stimulus attached.

• Single-leg Romanian deadlifts. Foot, lower leg and hip in one movement. Hold onto something at first so you can load the hip rather than fighting for balance. Landmine, kettlebell or barbell all work.

• Plyometric progression. Skipping first, then higher skips, then single-leg hops, then lateral hops, then maximal jumps for height or distance. Last thing back in, first thing to back off.

For a benchmark on calf capacity, the single-leg calf raise to failure gives you a number to work with.

Normative data from Hebert-Losier and colleagues (2017) puts a healthy 20 year old male at around 37 repetitions and a 40 year old at around 28, with women four to eight lower depending on age.

Two caveats before you test yourself against that. It was measured on a 10 degree incline at a cadence of 60 per minute, both of which make it harder than the version most people do on a flat floor at their own tempo. And it's a general population sample, not a tactical one. Use it as a floor rather than a target. Anyone sitting in the teens has a capacity problem worth fixing before running volume goes back up.

Ankle dorsiflexion and hip mobility belong in the daily routine rather than the treatment plan. Same for soft tissue work. It isn't breaking anything down or realigning anything, whatever you've been told. It can reduce pain and it feels good, both of which have value, but neither changes what the tibia is being asked to absorb.

On shoes, comfort is still the best selection filter anybody has found. The 200 to 500 mile replacement figure is a rule of thumb rather than a tested threshold, and it moves with body mass, gait and the shoe itself. Replace them when the midsole feels dead. Don't take a brand new pair into a big week.

How do you get back to running?

George and colleagues (2024) reviewed what the return-to-running literature agrees on after a tibial bone stress injury. The consistent themes are worth following even for straightforward MTSS:

• Pain free walking first. Most protocols want 30 minutes of pain-free walking, and pain-free daily activity, before any running load goes in.

• Local tenderness settled. Ideally for at least a week, though a persistently tender spot doesn't always stop a well-run progression.

• Alternate days, not consecutive. For the first two to four weeks.

• Distance before speed. Always. Every protocol in the review agrees on this one.

• Start slower than pre-injury pace. On a forgiving surface, on the flat, and off the hills.

• Pain during or after means stop. Rest until it settles, then resume one level below where you stopped. Not where you were heading.

Warden and colleagues (2014) laid out a four-stage progression that's still the most usable version of this. Each session requires the previous one completed pain free.

Table 4. Graded return to running, adapted from Warden et al. (2014). Complete each session pain free before moving to the next.

How long do shin splints take to heal?

Longer than anyone really wants to hear to be honest.

In Moen's trial, athletes on a graded running programme took an average of around 100 days to complete it. In novice and recreational runners the reported average time to recovery is closer to 70 days (Menendez et al., 2020). If symptoms have been running for three months or more before you start doing something about them, a full return anywhere between three and twelve months isn't unusual. A high-grade bone stress injury is typically 8 to 12 weeks to full clearance, and that's with the rehabilitation done properly.

Higher BMI and longer symptom duration both predict slower recovery. Neither is a reason to despair. Both are a reason to start now rather than in three weeks.

The number that matters more than any of those is the rate at which you go back. Most recurrences aren't a failure of rehab. They're a return to the same weekly volume that caused the problem, on a leg that spent three months detraining.

In summary

Shin splints are a load problem with a load solution. Reduce what's irritating the tibia, keep the aerobic engine running by other means, rebuild calf and foot capacity while you wait, and come back on a graded programme rather than by feel.

The temptation is always to look for the thing that fixes it. A shoe, an insole, a stretch, a therapist, a metronome. Those are adjuncts at best, and the evidence on most of them is thin. The programme is what fixes it.

The reason to take it seriously isn't the pain. It's the tibial stress fracture sitting at the end of the road if you don't.

Shin splints: frequently asked questions

Can I keep running with shin splints?

Sometimes, at reduced volume, if day-to-day activity is pain free and the running pain settles quickly afterwards. If walking or stairs hurt, no. Cut the volume until they don't, and hold it there.

Are shin splints and a stress fracture the same thing?

They sit on the same continuum at different severities. MTSS is diffuse tenderness spread over 5cm or more of the shin. A stress fracture is focal, under 5cm, and usually hurts on hopping. If you can cover the sore spot with two fingers, get it imaged.

How long until I can run properly again?

On a graded programme, around three months to complete it is typical (Moen et al., 2012). Three months or more of symptoms before you start can mean substantially longer. Novice runners recover faster than that average, and people who ignored it for a season take longer.

Do compression socks help shin splints?

They made no difference to recovery time in the one randomised trial that tested them properly. They're comfortable and they're harmless, so wear them if you like them. Just don't count them as treatment.

Will new running shoes fix my shin splints?

No. Comfort is the best criterion anyone has found for shoe selection, and there's no strong evidence that any particular shoe type prevents MTSS. Shock-absorbing insoles have better prevention evidence in recruits than shoe choice does, and both matter less than load management.

Should I stretch my calves for shin splints?

Ankle mobility is worth having and stretching is a reasonable way to keep it. Stretching in isolation hasn't been shown to treat MTSS. Keep it as daily hygiene rather than the plan.

Can I still tab with shin splints?

Load carriage raises tibial loading, so tabbing is part of the total you're trying to reduce, not an alternative to running. Cut it back alongside everything else and reintroduce it after running is re-established. Then progress weight and distance separately.

Why do my shin splints keep coming back?

Prior MTSS is the strongest single risk factor for another episode. Recurrence is nearly always a load problem: a return to full volume on a leg that lost capacity while it was healing. Rebuild the capacity before you rebuild the mileage.

References and further reading

Alrabai, H. M. (2024). Highlights of medial tibial stress syndrome in military recruits: a narrative review. Cureus, 16(12), e75376.

Anderson, L. M., Martin, J. F., Barton, C. J., & Bonanno, D. R. (2022). What is the effect of changing running step rate on injury, performance and biomechanics? A systematic review and meta-analysis. Sports Medicine - Open, 8, 112.

Becker, J., Nakajima, M., & Wu, W. F. W. (2018). Factors contributing to medial tibial stress syndrome in runners: a prospective study. Medicine & Science in Sports & Exercise, 50(10), 2092-2100.

George, E., Sheerin, K., & Reid, D. (2024). Criteria and guidelines for returning to running following a tibial bone stress injury: a scoping review. Sports Medicine, 54.

Han, S., Park, J., Lee, J., Ellison, M., Farris, D., & Rice, H. (2025). Footwear has a modifying effect on tibial loading during military weight carriage. Scientific Reports, 15, 26531.

Hebert-Losier, K., Wessman, C., Alricsson, M., & Svantesson, U. (2017). Updated reliability and normative values for the standing heel-rise test in healthy adults. Physiotherapy, 103(3), 434-441.

Lappe, J., Cullen, D., Haynatzki, G., Recker, R., Ahlf, R., & Thompson, K. (2008). Calcium and vitamin D supplementation decreases incidence of stress fractures in female navy recruits. Journal of Bone and Mineral Research, 23(5), 741-749.

Menendez, C., Batalla, L., Prieto, A., Rodriguez, M. A., Crespo, I., & Olmedillas, H. (2020). Medial tibial stress syndrome in novice and recreational runners: a systematic review. International Journal of Environmental Research and Public Health, 17(20), 7457.

Moen, M. H., Holtslag, L., Bakker, E., Barten, C., Weir, A., Tol, J. L., & Backx, F. (2012). The treatment of medial tibial stress syndrome in athletes; a randomized clinical trial. Sports Medicine, Arthroscopy, Rehabilitation, Therapy & Technology, 4, 12.

Sharma, J., Weston, M., Batterham, A. M., & Spears, I. R. (2014). Gait retraining and incidence of medial tibial stress syndrome in army recruits. Medicine & Science in Sports & Exercise, 46(9), 1684-1692.

Warden, S. J., Davis, I. S., & Fredericson, M. (2014). Management and prevention of bone stress injuries in long-distance runners. Journal of Orthopaedic & Sports Physical Therapy, 44(10), 749-765.

Winters, M., Eskes, M., Weir, A., Moen, M. H., Backx, F. J. G., & Bakker, E. W. P. (2013). Treatment of medial tibial stress syndrome: a systematic review. Sports Medicine, 43(12), 1315-1333.

Winters, M., Bakker, E. W. P., Moen, M. H., Barten, C. C., Teeuwen, R., & Weir, A. (2018). Medial tibial stress syndrome can be diagnosed reliably using history and physical examination. British Journal of Sports Medicine, 52(19), 1267-1272.

Every Stoic Conditioning programme progresses running and load carriage in controlled steps, with calf, foot and lower leg conditioning built in alongside the strength and conditioning work. Seven days free.