An ACL injury can change the course of a young athlete’s season in a matter of seconds. A sudden landing, sharp change of direction, or awkward pivot can lead to months away from sport.
The good news is that many ACL injuries happen during movements we can train for.
At Physium, we work with junior athletes across Melbourne’s northern suburbs to improve strength, movement control, and confidence before injuries happen. The goal is not to make athletes avoid sport. It is to prepare their bodies for the demands of competition.
As someone who has personally gone through ACL reconstruction and rehabilitation, I understand the frustration of sitting on the sidelines. I also understand how important it is to rebuild trust in your body before returning to the sport you love.
A well-designed ACL injury prevention program helps young athletes develop the skills they need to land safely, change direction efficiently, and handle high-speed movements with better control.
Why ACL Injuries Are A Serious Concern For Junior Athletes
The anterior cruciate ligament (ACL) is one of the main structures that helps stabilise the knee. It supports movements that involve twisting, stopping, jumping, and changing direction.
For junior athletes, an ACL injury can have a major impact because sport is often a big part of their routine and identity.
A typical recovery journey may involve:
| Recovery Stage | What It Involves |
| Early recovery | Reducing swelling, restoring movement, regaining basic strength |
| Strength phase | Building muscle capacity and improving knee control |
| Sport preparation | Running, jumping, changing direction, and sport-specific drills |
| Return to competition | Gradual exposure back to full training and games |
A young footballer may miss an entire season. A teenage netball player may spend months working back towards the movements they previously performed without thinking.
The physical recovery matters, but so does confidence.
Many athletes say the hardest part is not walking or running again. It is trusting their knee when they have to cut, jump, or compete at full speed.
Why Non-Contact Movements Cause Many ACL Injuries
A common misunderstanding is that ACL injuries mainly happen through collisions.
In junior sport, many ACL injuries occur without another player making contact.
They often happen during:
- Landing after a jump
- Slowing down quickly
- Changing direction at speed
- Pivoting with the foot fixed to the ground
- Losing control during a single-leg movement
For example, a 15-year-old soccer player may not hurt their knee during a tackle. They may injure their ACL while planting their foot to turn and chase the ball.
The movement itself is not dangerous. Sport requires these actions. The issue is whether the athlete has developed enough strength and control to manage the forces involved.
The Key Factors That Increase ACL Injury Risk In Teen Athletes
ACL injuries usually happen because the knee is placed under more stress than it can currently control.
This can happen because of movement patterns, strength differences, growth changes, or training habits.
Poor Landing Mechanics And Knee Control
One of the most common risk factors we assess is how an athlete lands and controls their knee during movement.
A higher-risk landing position often involves:
- The knee moving inward towards the middle of the body
- The hip dropping during a single-leg movement
- Poor balance after landing
- Limited control when slowing down
This is sometimes described as a “knee collapse” position.
Imagine a basketball player landing after grabbing a rebound. Their foot hits the floor, but their knee moves inward instead of staying aligned with their toes. That movement places more stress through the knee.
The solution is not simply telling an athlete to “keep their knees straight”.
They need to train the muscles and coordination that allow them to control the position naturally.
A strong landing should include:
| Area | What Good Control Looks Like |
| Knee | Tracks over the toes |
| Hip | Remains stable during movement |
| Trunk | Stays controlled and balanced |
| Foot | Maintains a strong contact position |
| Landing | Absorbs force smoothly |
A simple coaching cue we often use is:
“Land quietly, control the movement, and be ready for the next action.”
Muscle Imbalances And Reduced Hip Strength
Young athletes often focus heavily on the muscles they can see and feel, especially the quadriceps at the front of the thigh.
However, ACL prevention is not just about having strong legs.
The hips, glutes, hamstrings, and core all contribute to knee control.
Common issues include:
- Strong quadriceps but weaker hamstrings
- Poor glute activation
- Reduced single-leg strength
- Limited trunk control during movement
A soccer player who can squat heavily in the gym may still struggle with controlling their knee during a fast change of direction.
Sport does not happen in a controlled gym environment. Athletes need strength that transfers into unpredictable movements.
The Impact Of Early Single-Sport Specialisation
Many young athletes now train in one sport all year round from an early age.
While dedication is important, playing only one sport from a young age can increase repetitive stress on the same movements and tissues.
For example:
- A young footballer may repeatedly perform sprinting and kicking patterns.
- A netball player may repeatedly jump and land.
- A tennis player may repeatedly rotate and accelerate in one direction.
Playing multiple sports can help develop:
- Different movement skills
- Better coordination
- Wider athletic ability
- More balanced physical development
A well-rounded athlete often has a better movement foundation.
The Role Of Growth And Development In ACL Risk
The teenage years involve rapid physical changes.
Athletes can become taller, stronger, and faster within a short period. However, their coordination does not always immediately match these changes.
This is why some athletes look slightly awkward during growth periods. Their body is changing quickly, and their movement patterns need time to adjust.
A prevention program helps athletes maintain control during these changes by developing:
- Strength
- Balance
- Body awareness
- Landing skills
- Change-of-direction technique
Starting early is valuable because movement habits become easier to maintain once they are trained consistently.
The 5 Essential Components Of An ACL Injury Prevention Program
An effective ACL injury prevention program does not rely on one exercise or one type of training.
Young athletes need a combination of strength, coordination, balance, and sport-specific movement training. The aim is to help the body respond better when the demands of sport increase.
At Physium, we often explain rehabilitation and injury prevention in a simple way: the body needs to earn the ability to handle higher loads.
A junior athlete does not just need to be strong in the gym. They need to be strong enough to sprint, jump, land, and change direction when they are tired and under pressure.
These five areas form the foundation of an effective ACL prevention program.
1. Hip And Glute Strengthening To Improve Knee Control
The hips and glutes play a major role in controlling the position of the knee during movement.
When these muscles work well, they help keep the leg aligned during running, jumping, and cutting movements.
When hip control is poor, the knee may collapse inward, increasing stress through the ACL.
Useful ACL prevention exercises for hip strength include:
- Single-leg glute bridges
- Side-lying hip abductions
- Monster walks with resistance bands
- Clamshell exercises
- Single-leg squats
The key is not just completing repetitions. Athletes need to perform these movements with control.
For example, a young athlete might complete 20 single-leg squats, but if every repetition involves the knee collapsing inward, they are practising the wrong movement pattern.
Quality always comes before quantity.
How Hip Strength Transfers Into Sport
A strong hip helps athletes:
- Push off more effectively when sprinting
- Control their body during direction changes
- Maintain knee alignment during landing
- Reduce unnecessary stress through the knee
A midfielder in soccer, for example, may change direction dozens of times during a match. Their body needs to repeat those movements safely, not just once in training.
2. Core Stability And Trunk Control For Better Movement
The core does more than create abdominal strength.
It helps control the position of the body when athletes accelerate, stop, jump, and land.
Poor trunk control can affect how forces move through the legs.
If an athlete’s upper body shifts heavily during a landing or change of direction, the knee may be forced into a weaker position.
Important ACL prevention exercises for core control include:
- Planks
- Side planks
- Dead bugs
- Bird dogs
These exercises teach athletes to maintain control while their arms and legs move.
A good example is a netball player landing after a jump. They need their trunk, hips, and legs working together to stay balanced before their next movement.
The knee is only one part of the system.
3. Plyometrics And Landing Technique
Plyometric training involves explosive movements such as jumping and hopping.
For young athletes, the goal is not simply to jump higher. It is learning how to absorb and control force safely.
Every sport involves moments where athletes must:
- Jump
- Land
- React quickly
- Change direction
Landing technique training teaches athletes how to manage these moments.
Key ACL Prevention Exercises For Landing Control
Examples include:
- Squat jumps
- Single-leg hop holds
- Lateral bounds
- Jump and stick movements
A “stick” landing means the athlete lands and holds their position instead of immediately losing balance.
Coaches and parents can look for these signs:
| Good Landing | Poor Landing |
| Knees stay aligned | Knees collapse inward |
| Athlete stays balanced | Athlete falls or rotates |
| Landing is controlled | Landing is loud and uncontrolled |
| Hips absorb force | Knees take most of the load |
At Physium, we often see athletes who are physically capable but have not been taught how to control these movements properly.
That is a skill that can be developed.
4. Balance And Proprioception Training
Proprioception is the body’s ability to understand where it is positioned in space.
This matters because sport is unpredictable.
An athlete may land on another player’s foot, change direction unexpectedly, or lose balance during a contest. Their body needs to react quickly.
Balance training improves the communication between the brain, muscles, and joints.
Useful exercises include:
- Single-leg balance holds
- Single-leg reaches
- Balance with eyes closed
- Tandem walking
- Controlled single-leg movements
A junior athlete who trains balance regularly may develop better automatic responses during competition.
This is especially important for sports played on unstable surfaces or with constant changes of direction, such as soccer, football, and netball.
5. Agility And Deceleration Training
Many ACL injuries occur when athletes slow down or change direction.
This is why prevention programs must include more than straight-line running.
Athletes need to practise:
- Speed changes
- Cutting movements
- Side-to-side movements
- Controlled stopping
Useful drills include:
- T-drills
- 5-10-5 shuttle runs
- Zig-zag running
- Change-of-direction drills
The goal is to teach athletes how to control their body before adding more speed.
A common mistake is progressing too quickly.
An athlete may feel comfortable jogging, but sprinting, cutting, and reacting during a game create a completely different challenge.
A structured approach builds confidence step by step.
How Often Should Junior Athletes Complete ACL Prevention Exercises?
Consistency is where prevention programs succeed or fail.
A program that is completed once every few weeks will not create the same benefits as regular training.
For most junior athletes, prevention exercises should become part of normal training.
A practical weekly structure looks like this:
| Training Element | Recommendation |
| Frequency | 3-4 sessions per week |
| Session length | 20-30 minutes |
| Best timing | Before training or games |
| Program length | Continue throughout the season |
Many clubs already include warm-up routines before training. Adding ACL prevention exercises into this time makes them easier to maintain.
Programs such as FIFA 11+ have shown how structured warm-ups can become part of everyday sporting routines.
The biggest factor is not having the perfect exercise list. It is doing the work consistently.
How Parents And Coaches Can Build ACL Prevention Training Into Weekly Sport
Preventing ACL injuries is not only the responsibility of the athlete.
Parents, coaches, and support staff all play an important role in creating good training habits. The best prevention program is the one that becomes part of the athlete’s normal routine.
For junior athletes, consistency matters more than occasional intense sessions.
A 20-minute movement session completed several times each week can have a greater impact than a long training session completed once a month.
At Physium, we often see the difference between athletes who treat prevention as part of their training and those who only focus on it after an injury occurs.
The goal is to build these habits before there is a problem.
Creating A Simple ACL Prevention Routine
A practical warm-up routine before training can include:
| Training Area | Example Exercises |
| Movement preparation | Jogging, dynamic movements, mobility drills |
| Strength activation | Glute bridges, squats, resistance band walks |
| Landing control | Jump and stick, single-leg landing practice |
| Balance | Single-leg holds and controlled movements |
| Agility | Change-of-direction drills |
This approach works well because it prepares the athlete for the exact movements they will perform during sport.
A soccer player needs to prepare for sprinting and cutting.
A netball player needs to prepare for jumping and landing.
A football player needs to prepare for acceleration, contact, and sudden changes of direction.
The training should match the demands of the sport.
Why Starting Before Injury Happens Matters
Many young athletes only begin structured rehabilitation after something goes wrong.
They wait until:
- Their knee starts hurting
- They feel unstable
- They suffer an injury
- A coach tells them they need help
Prevention works differently.
It builds capacity before the athlete reaches their limit.
A simple way to think about it is:
The stronger and more prepared the body is, the more load it can handle.
This does not remove all injury risk. Sport will always involve unpredictability. However, better preparation gives athletes a stronger foundation.
How To Identify Junior Athletes With Higher ACL Injury Risk
Some athletes may benefit from additional screening before starting high-level competition.
A movement assessment can identify areas that need improvement before they become bigger problems.
At Physium, we look at how athletes move, not just how much weight they can lift or how fast they can run.
A strong athlete with poor movement control may still need targeted training.
Single-Leg Squat Assessment
The single-leg squat is a simple way to observe lower limb control.
During this movement, clinicians look for:
- Knee alignment
- Hip stability
- Balance
- Control through the movement
A common concern is the knee moving inward during the squat.
This does not mean an athlete will definitely suffer an ACL injury. It simply highlights an area where training may help.
Hop Testing For Strength And Control Differences
Hop testing compares the performance of one leg against the other.
It can help identify:
- Strength differences
- Confidence differences
- Balance issues
- Reduced power after previous injury
A noticeable difference between legs may suggest an athlete needs further assessment before returning to full competition.
This is especially important for athletes returning after previous ACL injuries or lower limb injuries.
When A Junior Athlete Should See A Sports Physiotherapist
Not every knee concern requires extensive treatment, but some signs should not be ignored.
Parents and coaches should consider professional assessment if an athlete experiences:
- Ongoing knee pain
- Swelling after training or games
- A popping sensation during injury
- The knee giving way
- Difficulty changing direction confidently
- Significant differences between legs
- Reduced confidence after returning from injury
Early assessment can help identify whether the athlete needs:
- Strength development
- Movement retraining
- A structured rehabilitation plan
- Further medical review
Getting advice early can prevent small issues from becoming bigger setbacks.
How Physium Helps Junior Athletes Reduce ACL Injury Risk
At Physium, our approach combines assessment, education, strength training, and sport-specific rehabilitation.
We do not simply give athletes a list of exercises and send them away.
We look at:
- How they move
- What their sport requires
- Where their weaknesses are
- What needs to improve before returning to full competition
Our rehabilitation gym allows athletes to progress from basic movement exercises through to higher-level strength and sport preparation.
This approach reflects the same principles used in high-performance sport environments, while still being accessible for everyday athletes in the community.
Peter Gavalas brings personal experience from both sides of rehabilitation. Having gone through ACL reconstruction and other orthopaedic procedures himself, he understands the physical and mental challenges athletes face during recovery.
For junior athletes in Melbourne’s northern suburbs, this means receiving guidance from someone who understands the pressure of wanting to return to sport while also respecting the recovery process.
Final Takeaway: Building Stronger Athletes Before Injury Happens
ACL injuries can have a major impact on young athletes, but prevention starts long before an injury occurs.
A strong ACL injury prevention program focuses on:
- Building hip and leg strength
- Improving landing technique
- Developing balance and control
- Training sport-specific movements
- Creating consistent habits
The aim is not to make young athletes afraid of movement.
It is the opposite.
The goal is to help them move with confidence, compete safely, and continue doing the sports they enjoy.
For parents, coaches, and athletes, the message is simple:
Do not wait until an injury happens to start preparing the body. Build the foundation first.
