Shin Splints in AFL: What It Actually Is (and Why Rest Isn’t the Answer)

May 21

‘Shin splints’ is one of those terms that gets thrown around loosely. A player complains of shin pain, the label goes on, they’re told to rest, they come back in two weeks, and it returns inside a fortnight.

The problem is that shin pain in AFL players has multiple causes, and medial tibial stress syndrome (MTSS), the most common, sits on a continuum with tibial stress fracture. Getting the diagnosis right matters.

The Anatomy

The tibia bears approximately 75% of the load transferred through the lower leg during running. The medial tibial surface, running down the inside of the shin, is where the periosteum (the bone’s outer membrane) is repeatedly stressed during running, particularly with high volumes on hard surfaces.

MTSS describes periosteal inflammation and micro-damage at the distal two-thirds of the medial tibia, driven by the repeated load of running. The tibialis posterior, soleus, and flexor digitorum longus pull on the tibial periosteum with each stride, and in the context of rapid load increases or inadequate bone adaptation, the resulting stress accumulates.

At the far end of the spectrum, if load continues without adaptation time, cortical bone damage progresses to a tibial stress fracture. The difference matters clinically and determines management.

How It Develops in AFL

Pre-season is the highest-risk period. Players return from off-seasons with reduced bone density and running fitness, then immediately begin high-volume pre-season programs on hard oval surfaces or synthetic tracks. The bone hasn’t had time to adapt.

Biomechanical factors including increased hip adduction during running, foot pronation, and reduced ankle dorsiflexion increase tibial load and are common in AFL players.

Distinguishing MTSS from Stress Fracture

MTSS: diffuse tenderness along the lower medial tibia, typically more than 5cm in length, pain at the start of running that eases with warmup.

Stress fracture: localised, pinpoint tenderness (often as small as 1-2cm), pain that does not ease during running, may include night pain and pain during normal walking.

MRI is the gold standard for differentiating the two. If a tibial stress fracture is suspected, imaging before return to running is non-negotiable.

Treatment

For MTSS, the treatment is load management, not rest.

Step 1: Reduce running volume by 30-50%, maintaining total training load through aqua jogging, cycling, and gym work. Step 2: Address contributing factors: calf and tibialis posterior strengthening, hip abductor strengthening, footwear assessment, and running surface modification. Step 3: Gradual running load increase of no more than 10% per week once symptoms settle.

Complete rest leads to de-conditioning without addressing the underlying bone loading issue. A structured return often results in recurrence at the same point in the next pre-season.

For Stress Fractures

Low-risk tibial stress fractures (involving the posteromedial cortex) are managed conservatively with a graduated return to running over 6-10 weeks. High-risk stress fractures (anterior cortex, the tension side) require surgical consultation and may require 12-16 weeks off running.

Prevention

Progressive pre-season load planning is the most effective prevention strategy. Calcium and Vitamin D optimisation, adequate sleep, and nutritional support for bone health are underemphasised in community AFL.

Running technique work addressing excessive hip drop and foot strike patterns reduces tibial stress significantly.

Want to understand this injury at a deeper anatomical level? The Club Physio’s online anatomy course breaks down the structures, biomechanics, and load patterns behind the most common sports injuries. Built for athletes and therapists alike. [Explore the course at theclubphysio.com.au]

josh zoppo