Shin Splints: What’s Actually Happening in Your Leg (And Why Rest Alone Won’t Fix It)
Every spring, as sidewalks clear and running shoes come out of storage, a familiar ache shows up for thousands of Winnipeg runners: a dull, nagging pain along the inside of the shinbone that starts manageable and builds into something that stops a run in its tracks. Medial tibial stress syndrome — better known as shin splints — is one of the most common overuse injuries in recreational and competitive runners alike, accounting for up to 35% of all running-related injuries.1
Understanding what's actually happening in the tissue can change how you approach it — and more importantly, how you get back to running without the same cycle of pain and frustration.
What's Happening in the Bone and Surrounding Tissue
The term "shin splints" is a catch-all phrase that gets applied to any lower leg pain, but true medial tibial stress syndrome (MTSS) refers specifically to pain along the posteromedial border of the tibia — the inner edge of the shinbone — brought on by repetitive mechanical loading. At the tissue level, bone is constantly remodeling in response to stress. When load accumulates faster than the bone can adapt, the remodeling process falls behind. Microstructural stress builds within the cortical bone, and the result is local inflammation, periosteal irritation, and pain.2
There's also a muscular component. The tibialis posterior, soleus, and flexor digitorum longus all attach along the posteromedial tibia. As these muscles fatigue with repetitive impact, they lose their ability to absorb and distribute force — shifting more stress onto the bone itself.3
Why It Tends to Show Up in Spring
The timing isn't a coincidence. After months of reduced activity or indoor treadmill work at a controlled pace, most people return to outdoor running with enthusiasm — and with a bone and connective tissue base that hasn't yet adapted to the specific demands of pavement, varying terrain, and outdoor cold. Running on uneven surfaces, changing inclines, and shoes that may have lost their cushioning over winter all shift how force travels up the leg.
The research on this is fairly consistent: the most reliable predictor of developing MTSS isn't a structural flaw in the foot or some inherent weakness — it's a rapid, unmanaged increase in training load.4 The body is genuinely capable of adapting to remarkable amounts of stress over time. The issue is almost always the rate at which that load is introduced, not the load itself.
Sports scientist Tim Gabbett's influential work on training load and injury risk demonstrated that athletes who spiked their workload too sharply — without adequate recovery — were substantially more likely to sustain overuse injuries than those who built up progressively.5 The takeaway isn't to do less. It's that there are no bad exercises, only load increases that temporarily outpace the body's current ability to absorb them. The goal is closing that gap, not avoiding the activity.
What Actually Helps
Rest is the default recommendation, and it does reduce pain — but it also reduces the bone's load tolerance, meaning a return to the same training at the same pace often recreates the same injury. Managing shin splints is more nuanced than simply stopping.
A few evidence-informed principles tend to make a meaningful difference:
Load modification, not load elimination. Continuing to move at a reduced intensity maintains tissue tolerance while symptoms settle. Cross-training with lower-impact options — cycling, pool running, swimming — preserves cardiovascular fitness while removing the repetitive ground reaction forces that are stressing the tibia.
Progressive reloading. Returning to running gradually, building weekly mileage no faster than about 10% per week, gives the bone's remodeling cycle time to keep pace with demand. The pain-free progression is slower than most people want, but it's far more reliable than pushing through discomfort and repeating the same cycle through summer.
Strengthening the posterior chain. Calf raises, tibialis raises, and hip strengthening exercises address the muscular fatigue patterns that shift excess load onto bone. These are longer-term interventions — bone adaptation timelines are measured in weeks to months — but they're central to a lasting resolution rather than a temporary one.3
Footwear and gait assessment. Running shoe cushioning degrades significantly after 400–600 kilometres, and worn shoes meaningfully change how impact forces distribute through the lower leg. A trained assessment of running mechanics can also identify gait patterns — like excessive crossover stride or high vertical loading at heel strike — that concentrate tibial stress beyond what the tissue can tolerate.
When It's Worth Getting Assessed
Most MTSS cases respond well to load management and a gradual return to activity. The important reason to have persistent shin pain evaluated clinically is to rule out a tibial stress fracture, which can present similarly but requires a different management approach — including a more complete rest period and sometimes imaging to grade severity.2
Pain that is sharply localized to one small point on the bone rather than diffuse along the inner shin, pain that persists at rest or wakes you at night, or pain that stops a run abruptly rather than building gradually are all patterns worth looking into further.
The team at Boreal Spine & Sport in Winnipeg assesses shin pain with a functional movement screen alongside the clinical picture, which helps identify the contributing biomechanical factors so the management plan addresses the actual drivers — not just the symptom.
Author: Dr. Michael Minenna D.C., B.Sc., SFMA, FMS
References
Reshef N, Guelich DR. Medial tibial stress syndrome. Clin Sports Med. 2012;31(2):273–290.
Moen MH, Tol JL, Weir A, Steunebrink M, De Winter TC. Medial tibial stress syndrome: a critical review. Sports Med. 2009;39(7):523–546.
Galbraith RM, Lavallee ME. Medial tibial stress syndrome: conservative treatment options. Curr Rev Musculoskelet Med. 2009;2(3):127–133.
Winters M, Eskes M, Weir A, Moen MH, Backx FJ, Bakker EW. Treatment of medial tibial stress syndrome: a systematic review. Sports Med. 2013;43(12):1315–1333.
Gabbett TJ. The training-injury prevention paradox: should athletes be training smarter and harder? Br J Sports Med. 2016;50(5):273–280.