Hamstring Strains in AFL: Why They Keep Coming Back and What to Do About It

Apr 21

Ask any AFL physio what the most frustrating injury in the game is and most will say the same thing: the hamstring that keeps coming back.

The recurrence rate for hamstring strains in elite AFL is around 17%. In community football, it’s higher. The reason isn’t bad luck. It’s biology, load management, and what happens in the weeks after the first injury.

The Anatomy Behind the Problem

The hamstring group is made up of three muscles: the biceps femoris (long and short head), semimembranosus, and semitendinosus. They cross two joints, the hip and the knee, which means they’re generating and absorbing force simultaneously during sprinting.

In AFL, the most commonly injured structure is the proximal free tendon of the biceps femoris, just below where the muscle originates off the ischial tuberosity (sit bone). This region has a notoriously poor blood supply and generates scar tissue under loading rather than true muscle fibre, which is why it reinjures.

The interplay between hamstring length, hip flexor tightness, lumbo-pelvic control, and running mechanics is complex. It’s worth understanding in detail if you’re a player, coach, or therapist working with this injury. The anatomy course covers the full posterior chain, from origin to insertion, with sport-specific context.

How It Happens in AFL

High-speed running is the primary mechanism. The hamstring is most vulnerable during the late swing phase of sprinting, when it’s at near-maximum length and switching from lengthening to contraction to decelerate the leg. In AFL, where players cover 12-14km per game with 40-60 high-intensity efforts, this phase repeats hundreds of times.

Kicking mechanics also load the hamstring in the follow-through phase, particularly in drop punts at full extension.

Grading and What It Means

Grade 1: Mild stretch, minimal structural damage. Two to ten days off. Grade 2: Partial tear. Three to six weeks, depending on location and extent. Grade 3: Complete rupture. Rare, but 10-16 weeks minimum.

Location matters as much as grade. Proximal tendon injuries at the musculotendinous junction take significantly longer than mid-belly tears, regardless of what the MRI grade says.

Treatment and Rehab

The evidence is clear on one thing: doing nothing is the worst option. Early movement, progressive loading, and a structured return-to-running program consistently outperform passive rest.

Nordics and other eccentric hamstring exercises are the cornerstone of both rehab and prevention. Heavy slow resistance training through full range is the evidence-based standard.

A common mistake is progressing too quickly from straight-line jogging to sprint work. There’s a significant jump in hamstring load between 70% and 95% sprint speed. This is where most recurrences happen.

Return to Running Protocol

A basic return-to-running framework for a Grade 2 strain:

• Week 1-2: Walking, pool running, low-load gym work

• Week 3: Jogging to 60% effort, straight line only

• Week 4: Increasing to 75%, add curved running

• Week 5: 85-90%, progressive volume

• Week 6: Sprint work, change of direction, clearance criteria

Criteria-based testing before return to full training: sprint symmetry assessment, single-leg bridge hold, and Nordic curl load tolerance.

Prevention

The data on Nordics is unambiguous. Teams that run structured Nordic hamstring programs reduce hamstring strain incidence by 51%. They’re uncomfortable, they’re under-used, and they work.

Monitoring GPS sprint load, particularly the volume of efforts above 85% max speed each week, is the most effective tool for managing recurrence risk at the training level.

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