Junior AFL Overuse Injuries: Warning Signs, Prevention & When to See a Physio
Overuse & Growth Injuries in Junior AFL (What Parents & Coaches Need to Know)
In Junior AFL, the “injury story” isn’t always about a dramatic collision or a single bad tackle.
For many kids, the biggest issue is what happens over time—through training volume, growth spurts, fatigue, and insufficient recovery.
If you’re a parent or coach in Glen Iris, Malvern East, Ashburton, or you’re part of the East Malvern Knights Junior Football Club, this guide will help you spot early warning signs and reduce the risk of overuse and growth-related injuries.
Key message: In adolescents, pain is often an early warning system—and addressing it early usually means less time out of sport later.
Why injury risk increases during adolescence
Teenagers aren’t just “smaller adults.” Their bodies are changing quickly:
- Physical growth & development: Bones, muscles, and tendons mature at different rates.
- Bones aren’t fully developed yet: Meaning they can be more vulnerable to repetitive loading.
- Cumulative load: Training isn’t the only factor—there’s also school sport, running at lunch, basketball, gym, and any “extras.”
- Recovery demands are higher: Adolescents generally need more sleep and more consistent recovery than adults do.
So when training load stacks up, the risk of overuse (and sometimes “bone stress”) rises.
Common overuse & growth-related injuries in junior AFL
Here are injuries we commonly see in young footballers when the body is loaded repeatedly without enough recovery.
1) Bone stress injuries (stress reactions / stress fractures)
What it is: Micro-damage builds up in bone because the bone is repeatedly loaded faster than it can repair.
Common signs:
- Pain that gradually builds over days or weeks
- Pain with running/jumping, sometimes lingering after training
- Localised tenderness (a “point” that’s sore)
- In more severe cases, pain may start affecting daily activities
Why it happens: Too much impact + not enough recovery (including sleep).
2) Osgood-Schlatter disease (tibial tuberosity pain)
Where: Pain just below the kneecap at the bony bump (tibial tuberosity).
Typical symptoms:
- Knee pain that’s worse with running, jumping, or kicking
- Tenderness at the bump below the kneecap
- Often flares during growth spurts
Common in: Boys and girls in the growth years who sprint/jump a lot.
3) Sever’s disease (calcaneal apophysitis)
Where: Heel pain, usually at the back of the heel.
Typical symptoms:
- Heel pain during activity, often worse in the morning or after sport
- Tenderness around the heel
- More painful during running, jumping, or quick changes of direction
Common in: Kids with growth spurts and high running demand.
4) “Biomechanical overload” pain (tissue irritation without a single big injury)
Some kids don’t have a clear “injury diagnosis,” but still develop pain because loading exceeds what the tissues can tolerate.
Examples can include:
- Patellofemoral pain (“runners knee”-type pain): discomfort around or behind the kneecap
- Shin pain or “shin splints”-type symptoms
- General tendon overload (tendinopathy patterns)
Common pattern: Pain during sport, early stiffness, and soreness that builds when training volume increases.
Early warning signs to watch for
One of the most important things parents and coaches can do is not wait for a “major injury.”
Look out for:
- Pain during sport (especially if it’s becoming more frequent)
- Ongoing soreness that doesn’t settle properly
- Fatigue / low energy
- Loss of appetite
- Poor sleep
- Performance drop
- Loss of enjoyment (yes—mental fatigue often shows up here too)
- Stress/anxiety about playing
If several of these are present, it usually means the body is struggling with current load.
The “Less is More” load management approach
Overuse injuries usually improve when load is reduced and recovery is protected—not just when pain is “managed.”
The Hours = Age guideline ⏱️
A simple rule of thumb:
- Weekly organised sport hours should not exceed the athlete’s age
- Example: a 13-year-old ≈ ~13 hours/week max of organised sport
This helps prevent the situation where the body is under-recovered and overload becomes unavoidable.
Increase gradually (no big spikes) 📈
Try to increase sport exposure or training volume by no more than:
- ~10–15% per week (as a general guide)
Big jumps—especially during growth spurts—are a common trigger.
Protect rest days 🛌
- Aim for 1–2 complete rest days per week
- Avoid year-round participation in one sport
- Consider 2–3 months off per year from a single sport where possible
(“Offloading” doesn’t mean quitting—just recovering.)
Traffic Light System for youth AFL
Use this as a practical decision tool.
Green Light — Healthy loads
- Weekly sport hours ≤ age
- 1–2 rest days/week
- Playing multiple sports
- Gradual increases
- No ongoing pain during sport
- Get 8-10hrs sleep most nights
- Kid is generally enjoying sport and recovering well
Yellow Light — Caution
- Weekly sport hours > age
- Year-round participation in one sport
- Rapid increases in load
- Early signs of fatigue, soreness, or niggles
Action: review the schedule and reduce load.
Red Light — Highest injury risk
- Pain during or after sport
- Playing through injury
- Very high weekly training loads
- No rest days
- Poor sleep or “lost their spark”
- Pressure to specialise early
Action: reduce load and get assessed.
What about “extra sessions” (skills, running, gym)?
It’s completely understandable—parents and coaches want kids to improve.
But when a growing athlete is already carrying a heavy weekly load, “extras” can add fuel to the fire.
Consider asking:
- “If these loads were applied to an AFL player, would the club allow it?”
- “Is the athlete recovering enough to adapt?”
If the answer is no, then the extras may be costing more than they give.
Early Sport Specialisation: Does More AFL Lead to Better AFL Players?
One of the biggest trends in junior sport over the last decade has been early sport specialisation.
This usually means a young athlete focuses on one sport year-round, often from a very young age, while reducing or completely stopping participation in other sports.
For AFL players, this can look like:
- Playing football across multiple teams or competitions
- AFL-specific academy programs
- Additional running programs
- Extra skills sessions
- Football-focused gym programs
- Little or no participation in other sports
While this approach is often well-intentioned, research consistently shows that specialising early may actually increase injury risk rather than improve long-term performance.
What are the risks?
Early sport specialisation has been linked to:
- Higher rates of overuse injuries
- Increased risk of stress fractures
- Greater mental fatigue and burnout
- Reduced enjoyment of sport
- Increased pressure and anxiety around performance
When the same movements are repeated over and over again without enough variety or recovery, the growing body is exposed to repeated stress on the same tissues.
Does specialising early create elite athletes?
Surprisingly, the evidence suggests not necessarily.
Research looking at elite athletes, including Olympic competitors, found that most spent years playing multiple sports before specialising later in adolescence.
Playing a variety of sports appears to help develop:
- Better overall athleticism
- More robust movement skills
- Improved coordination and adaptability
- Lower injury risk
- Greater enjoyment and long-term participation
The goal isn’t to be the best 13-year-old
One of the most important messages for parents and coaches is this:
The best young athletes aren’t always the busiest athletes.
Success in junior sport isn’t about accumulating the most training hours at age 12 or 13.
The athletes who ultimately perform best are often the ones who stay healthy, continue enjoying sport, and are still playing years later.
As we often remind young footballers:
“Nobody gets drafted at 12.”
AFL development is a long-term process. For most young athletes, playing multiple sports, protecting recovery, and staying injury-free is a far better strategy than trying to specialise too early.
When should you see a physio?
If your junior AFL player has pain that’s:
- Persistent or worsening
- Present for more than 2 weeks
- Gradually worsening (especially if it’s getting harder to play)
- Waking them at night
- Causing morning stiffness
- Affecting their ability to train normally
…it’s time for a proper assessment.
Early intervention matters because it often prevents a minor overload from turning into a more serious bone/tissue problem.
The Big Picture
For young AFL players, the goal shouldn’t simply be to play more football.
The real goal is to stay healthy, enjoy sport, continue developing, and build habits that allow participation for years to come.
The best players aren’t necessarily the busiest players at 13.
They’re the players who are still playing, improving, and enjoying their sport at 18, 23 and beyond.
Managing training loads, respecting recovery, and addressing pain early gives young athletes the best chance of long-term success.
Local note: SportsFit Physio & Health (East Malvern Knights)
If you’re in Glen Iris, Malvern East or Ashburton and your child plays for the East Malvern Knights, SportsFit Physio & Health is proud to be the club’s designated Physiotherapy Hub.
As part of this partnership, all Knights players have access to our dedicated Monday (K)Night Injury Clinic — a low-cost, 10-minute injury assessment designed to provide rapid access to physiotherapy advice after a weekend of footy.
Rather than waiting days or weeks for an appointment, players can receive an early assessment, provisional diagnosis, guidance on whether they can train or play, and fast access to the next steps in management, including physiotherapy treatment, rehabilitation planning, imaging referrals, boots, crutches or other supports where required.
The aim is simple: identify injuries early, start the right management quickly, and help keep young athletes healthy and on the field.
Todd Grbac
Physiotherapist
