How Do You Know You're Ready to Return to Sport After an ACL?
Feeling ready and being ready to return to sport after an ACL injury are two very different things.
Here's the misconception that catches people out: you're nine months post-surgery, the knee feels pretty good, you've done a bit of rehab, so you must be ready to play. The alternative is a data-driven rehab with actual numbers proving your knee can handle what the game will throw at it.
That gap between "feels good" and "tests well" is exactly where re-injuries live. So this week I want to show you how we test it.
What equipment do we use to test ACL recovery?
At Valley Physio we use VALD ForceDecks: force plates you stand and jump on that measure precisely how you move. How high you jump, how fast you get off the ground, and critically, how much force goes through each leg.
That last part matters most.
It gives us insight no amount of eyeballing a jump ever could, and those numbers help show us your risk of further injury before you set foot on a field.
What are the four jump tests for ACL return to sport?
1. The countermovement jump. A standard two-legged jump, but we're not just watching how high you go. We're watching how even you are. We want the force driving that jump split within about 5% between your legs, proof that your ACL side is genuinely pulling its weight rather than letting the good leg carry it.
2. The single leg jump. Now each leg has nowhere to hide. We measure the height on each side and compare. If your ACL side is more than 10% down, the quad and jump capacity aren't quite there yet. That's not an automatic fail for returning to play, but we know it means a higher risk of injury, and it tells us exactly what to train.
3. The drop jump. You drop off a box, hit the ground, and explode straight back up. This mimics one of the classic injury moments: landing from a header and immediately accelerating away. We're measuring the quality of your knee control and your speed off the ground, aiming for 1.3 metres per second. Fair warning: that's a professional-sport benchmark and a tough number for most of us amateur athletes, but the closer you get to it, the better placed you are.
4. The single leg drop jump. Same test, one leg. We're chasing 0.5 metres per second, but more importantly, we want left and right close to even, showing the ACL side has genuinely caught up.
Are two even legs the same as two strong legs?
Here's the trap symmetry alone can hide: you can have two even legs that are both weak. If the good leg has detrained during your rehab, matching it isn't much of an achievement.
That's the other advantage of this testing. We can compare your numbers against everyone else in your age group, so we know whether you've got two good knees, or just two even knees that both need building.
What happens if my numbers aren't there yet?
Then you've just learned something valuable before the field could teach it to you the hard way.
From your assessment we build a strength and conditioning program targeted at exactly the gaps the testing found, then retest to watch them close. Every session has a purpose, every milestone is a number, and when you do go back, you go back with evidence rather than hope.
What should I do next?
If you're going through ACL rehab right now and you don't have access to this kind of data, give us a yell. We'll run you through the assessment, show you exactly where you're sitting, and give you an honest read on how close, or how risky, a return to your sport would be. This is something we really focus on at Valley Physiotherapy across Thornton, Kurri Kurri, and Maitland.
Book in with one of our team and let's get you back out there with the numbers on your side. And if you've got questions, reply to this email and I'll happily give you a hand.
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