Shin Splints: Understanding Medial Tibial Stress Syndrome in Runners

Posted by Toe Rx on May 03, 2026

Shin splints, or Medial Tibial Stress Syndrome (MTSS), is a common overuse injury causing pain along the inner edge of the shinbone (tibia). It's particularly prevalent among beginners and runners rapidly increasing their mileage, often leading to training interruptions if not addressed early.

Prevalence and Statistics

MTSS affects 5%–35% of runners, making it one of the most frequent lower leg injuries. In specific studies, incidence rates range from 13.2% to 17.3% among novice and recreational runners, with higher risks for those new to running or ramping up volume. Among athletes, prevalence can reach up to 35%, and it contributes to 13.6% to 20% of running-related injuries, accounting for up to 60% of lower limb issues in some populations. Runners with previous injuries are more than twice as likely to develop MTSS, and it's more common in females and those with fewer years of experience.

Causes and Risk Factors

MTSS is primarily caused by repetitive stress on the tibia, leading to inflammation of surrounding muscles, tendons, and bone tissue. Key risk factors include:

Increased training volume or intensity, especially in beginners (e.g., >30% weekly distance increase).
Biomechanical issues, such as excessive foot pronation (navicular drop >10 mm), a higher BMI, and altered gait patterns, including reduced knee flexion or early heel lift.
Prior MTSS history (risk ratio 3.74), female gender (risk ratio 1.71), and training on hard or uneven surfaces.
Other factors: Inadequate warm-up, flat feet, vitamin D deficiency, and poor running technique contribute to tibial rotation and microcracks.

These elements are exacerbated in novices, where poor adaptation to impact loads leads to bone stress reactions.

Prevention and Management

Prevention focuses on gradual progression: avoid sudden mileage spikes, incorporate strength training for the lower limbs, and utilize biomechanical assessments to correct gait. Recommendations include wearing proper footwear with shock absorption and arch support, running on softer surfaces, and participating in multicomponent programs such as gait retraining, flexibility exercises, and neuromuscular control training. For management, rest, ice, pain relief (e.g., NSAIDs), and physiotherapy with stretching/strengthening resolve most cases, though recurrence is common (up to 79%). High-quality studies emphasize monitoring at-risk runners (e.g., females with high hip external rotation) and minimizing impact loads.

How Toe-Rx Can Help Prevent MTSS

Toe-Rx toe spacers address key biomechanical risk factors like excessive pronation and poor foot stability, which contribute to tibial stress. By spreading the toes for natural alignment and enabling active gripping to strengthen intrinsic foot muscles, Toe-Rx enhances arch support and reduces overpronation—potentially lowering the load on the shinbone during runs. Incorporate 10–15 minutes daily to build foot resilience, especially when increasing mileage, making it a proactive tool for MTSS prevention alongside gradual training.