ACL rehabilitation at ORBIT: return to sport based on data, not gut feeling.

19 June 2026

By Maarten Thysen
Co-Founder ORBIT - Sports Physiotherapist - Performance Specialist

An anterior cruciate ligament (ACL) injury is a turning point for many athletes. Not only physically, but also mentally. Suddenly, something that once felt automatic — accelerating, decelerating, jumping, landing, competing, pivoting — becomes uncertain again.

The first question is often:

“When can I return to sport?”

At ORBIT, we prefer to ask a different question:

What does your knee need to be able to do again so that returning to sport is safe, sustainable, and performance-oriented?

Because a successful ACL rehabilitation journey is not just about recovery. It is about rebuilding trust in your body, regaining the ability to handle sport-specific demands, and minimizing the risk of re-injury.

Why ACL Rehabilitation Is More Than Just Exercise

An ACL tear is common in pivoting sports such as football, basketball, volleyball, tennis, skiing, and other sports that involve frequent acceleration, direction changes, and landings.

After an ACL injury, with or without surgery, it is not enough to simply become pain-free or be able to walk again. Many athletes feel “good” after a few months, but objectively we often still see clear deficits in strength, control, explosiveness, or confidence.

That is exactly where the risk lies.

Returning based on time alone is too limited. Being six months post-surgery does not automatically mean you are ready. Being nine months post-surgery does not automatically mean you are safe either.

A good decision requires a combination of clinical evaluation, strength testing, jump testing, movement analysis, sport-specific loading, and mental readiness.

That is why at ORBIT we use a criteria-based approach:

You only move on to the next step when your body is ready for it.
Not because the calendar says so.

The ORBIT Vision on ACL Rehabilitation

Our approach is built around one goal:

helping athletes become available for their sport again, with a body that can handle the demands.

This means we look beyond the knee alone. An ACL rehabilitation journey also involves quadriceps strength, hamstring function, hip control, trunk stability, running mechanics, jumping and landing mechanics, conditioning, sleep, recovery, nutrition, and confidence.

We combine clinical physiotherapy with performance testing and targeted strength and rehabilitation training. This allows us to understand not only how you feel, but also where you truly stand.

At ORBIT in Leuven, we guide athletes throughout the entire process: from the initial phase after injury or surgery to return to running, return to training, and ultimately return to performance.

Phase 1: Creating Calm and Restoring the Foundation

The first phase is not about training hard. It is about regaining control.

After an ACL injury or reconstruction, we aim to create a calm knee as quickly as possible: less swelling, less pain, good mobility, and restored quadriceps control.

This may seem basic, but this phase is crucial. A knee that continues to react with swelling or loss of motion will have more difficulty tolerating load later on.

Athletes who rush through this phase often pay the price later in the rehabilitation process.

That is why we deliberately build up gradually, precisely, and in a controlled manner during this stage.

Phase 2: Building Strength, Control, and Load Capacity

Once the knee becomes calmer and basic function returns, the focus shifts toward strength and load capacity.

This is often the phase where the biggest differences are made.

At this point, many athletes can already function quite well in daily life. But sport demands much more than walking, cycling, or light exercises.

Your knee must once again be able to produce and absorb high forces. You need to be able to decelerate, land, push off, pivot, and react to unexpected situations.

That is why progressive strength training is essential.

During this phase, we use objective measurements where needed to determine whether strength development is progressing adequately.

Not only left-right symmetry matters, but also absolute strength. A leg may appear “symmetrical” simply because both legs are weak.

That is why we look beyond percentages alone.

Phase 3: From Rehabilitation to Sport Performance

The final phase is often the most underestimated.

This is the stage where many athletes start to feel like athletes again. They can run, jump, and train. The knee feels better. Confidence grows.

But sport is chaotic.

A game situation is not a controlled exercise in the gym. You must react to opponents, make decisions under time pressure, accelerate, decelerate, pivot, jump, and land while fatigued.

That requires a different level of preparation.

That is why we progressively build toward sport-specific demands during this phase.

The goal is not simply that you are allowed to return to sport.

The goal is that your body is once again prepared for the reality of your sport.

Return to Sport: When Are You Truly Ready?

At ORBIT, return-to-sport decisions are not based on gut feeling.

An athlete may feel ready while testing still reveals significant deficits. Conversely, someone may score well physically but still lack the confidence to move freely.

That is why we use a broader testing battery to better support return-to-sport decisions.

A good return-to-sport decision is never based on a single test. It is the combination of data that matters.

Our question is not:

“Are you nine months post-surgery?”

Our question is:

“Are you ready for what your sport demands from you?”

Why Testing Is So Important in ACL Rehabilitation

Without objective testing, rehabilitation becomes too much of a guessing game.

You cannot always feel whether your quadriceps are still 20% weaker. You do not always notice that your landing strategy has changed. And you may not realize that fatigue causes you to revert to protective movement patterns.

Testing makes visible what would otherwise remain hidden.

It helps to:

• train more effectively
• identify weak links
• monitor progress objectively
• better time your return to running
• build a safer return to training
• better support return-to-sport decisions

For athletes, this provides clarity. For coaches, physicians, and physiotherapists, it creates a common language.

And for the rehabilitation process, it leads to better decisions.

When Is Guidance at ORBIT Useful?

You can come to ORBIT during different stages of your ACL rehabilitation journey.

This may be immediately after your injury, to take the right first steps and begin prehabilitation. It may also be before or after surgery, to optimize your strength, mobility, and function.

But even later in your rehabilitation, an objective evaluation can provide valuable insight.

Guidance is especially useful when:

• you have a recent ACL injury
• you are scheduled for surgery or have recently undergone surgery
• you want to know whether you are ready to start running again
• your rehabilitation has stalled
• you are unsure whether you are ready for training or competition
• you want a second opinion regarding return to sport
• you want to return to sport with greater confidence

Returning Is Not the Finish Line

Successful ACL rehabilitation does not end the moment you step back onto the field.

The real challenge is staying available. Being able to train. Being able to compete. Being able to respond to increasing demands. And feeling confident in your body again.

That requires a process that looks beyond the knee alone.

At ORBIT, we combine sports physiotherapy, strength training, testing, and performance coaching to help athletes return stronger, smarter, and better prepared.

Not just back to sport.
Back to sport with a plan.

Want to Know Where You Stand in Your ACL Rehabilitation Journey?

Have you suffered an ACL injury, are you in the middle of rehabilitation, or are you unsure whether you are ready to run, train, or compete again?

Schedule an intake assessment or return-to-sport testing at ORBIT in Leuven.

We objectively assess where you currently stand and build a personalized pathway toward a safe and sustainable return to sport.