Posterior Shin Splints: Causes & Fix 2026 | DPM

Not all shin pain is the same. If your shin pain is along the inner back edge of your shinbone — and it aches deep rather than right on the bone surface — you may have posterior shin splints, the most common subtype of medial tibial stress syndrome seen in distance runners.

Here’s how to identify posterior shin splints, differentiate them from other leg pain, and treat them correctly.

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What Are Posterior Shin Splints?

Posterior medial tibial stress syndrome (MTSS) — commonly called posterior shin splints — is periosteal irritation along the posteromedial tibial border caused by repetitive muscle traction from the tibialis posterior, flexor digitorum longus, and soleus muscles. These muscles originate on the back-inner surface of the tibia, and with repetitive loading, their fascia and periosteal attachments become inflamed.

This is the most common form of shin splints in distance runners and accounts for up to 35% of all running injuries. The condition exists on a continuum: at one end is mild periosteal irritation (reversible with rest), at the other end is tibial stress fracture (requires medical management).

Posterior vs. Anterior Shin Splints: Key Differences

The inner-back vs. front distinction is important because the causes, risk factors, and treatments differ:

• Posterior shin splints: Pain along the posterior-medial tibial border (inner back edge of shin), deep aching character, strongly associated with overpronation and tibialis posterior muscle overload
• Anterior shin splints: Pain along the anterior tibia (front of shin), often a surface-level tenderness, associated with increased dorsiflexion demand (running uphill, sprinting, speed work)
• Compartment syndrome: Cramping tightness during runs that resolves quickly after stopping — bilateral more often, requires compartment pressure testing

What Causes Posterior Shin Splints?

• Overpronation: Excessive inward rolling of the foot dramatically increases tibialis posterior load — the muscle works overtime to control the arch collapse with every step
• Training volume spikes: Weekly mileage increases >10%, adding hills, switching surfaces
• Worn footwear: Midsole breakdown allows excessive pronation
• Weak tibialis posterior: Often overlooked — direct strengthening is key to resolution and prevention
• Tight calf complex: Limited ankle dorsiflexion redirects ground reaction forces to increase tibial bone stress
• Female sex: Women are 2–3× more likely to develop MTSS, partly due to hip mechanics and partly due to energy deficiency risk

Recognizing Posterior Shin Splints: The Clinical Picture

• Diffuse aching pain along the posterior-medial tibial border — not the front of the shin
• Tenderness when pressing along the inner-back edge of the tibia (the specific landmark: 2–6cm above the medial malleolus on the posterior tibial border)
• Pain at the START of runs, may ‘warm up,’ then returns or worsens
• Morning stiffness and achiness in the shins
• Pain with resisted plantarflexion and inversion (the tibialis posterior action)

Treatment Protocol

Immediate Phase (Week 1–2)

Reduce running by 50–75%. No speed work or hills. Cross-train with swimming or stationary cycling. Ice for 15 minutes after any activity. NSAIDs for acute pain management.

Correction Phase (Week 2–6)

• Tibialis posterior strengthening: Seated resisted inversion (theraband around forefoot, invert against resistance) — 3 sets × 20 reps daily. Single-leg heel raises with slight inversion. This is the most underperformed exercise in shin splint rehab.
• Soleus strengthening: Bent-knee heel raises (seated calf raises) target the soleus specifically — more relevant to posterior shin splints than gastrocnemius work
• Orthotics for pronation control: Custom or over-the-counter medial arch support dramatically reduces tibialis posterior load
• Footwear upgrade: Stability or motion-control running shoes if overpronation confirmed
• Calf stretching: Gastrocnemius and soleus stretches 3× daily

Return to Running (Week 4–10)

Structured walk-run progression, starting with run/walk ratios (1 min run: 2 min walk), increasing running proportion each week. Maximum 10% weekly mileage increase. Monitor pain: if pain exceeds 3/10 during or after running, don’t progress that week.

Frequently Asked Questions

How do I know if my posterior shin pain is a stress fracture?

Stress fracture pain is pinpoint (one finger can identify the exact spot), worsens progressively throughout a run, doesn’t warm up, and may hurt at rest or at night. MTSS pain is diffuse along a broad tibial region, often warms up mid-run, and is typically only symptomatic with running. When in doubt, see a podiatrist — imaging can confirm.

Does posterior shin splints affect one leg or both?

Both, usually — though one side is often more symptomatic. Bilateral presentation is more consistent with MTSS; a unilateral acute onset with pinpoint tenderness should raise concern for stress fracture.

Can I run with posterior shin splints?

With mild symptoms (pain ≤3/10, no worsening during run), reduced mileage is often possible. If pain worsens during the run, persists after, or requires gait modification, stop running until evaluated.

Are posterior shin splints the same as a posterior tibial tendon problem?

Not exactly — posterior shin splints involve the tibial periosteum and muscle fascia attachments, while posterior tibial tendon dysfunction (PTTD) affects the tendon further down toward the ankle. Both are driven by tibialis posterior overload from overpronation.

The Bottom Line

Posterior shin splints are a warning sign that the tibialis posterior and tibial bone are under excessive load. Rest alone without addressing the root causes — overpronation, muscle weakness, training errors — leads to repeated cycles of injury.

At Balance Foot & Ankle, we provide biomechanical gait analysis, custom orthotics, and sport-specific rehabilitation protocols to get runners back on the road with a durable fix.

Sources

1. Moen MH, et al. Medial tibial stress syndrome. Sports Med. 2009;39(7):523-546.
2. Newman P, et al. Risk factors for medial tibial stress syndrome. Br J Sports Med. 2013;47(4):239-244.
3. Reinking MF, et al. Medial tibial stress syndrome. JOSPT. 2017;47(9):656-664.