How to return to sport after an ACL reconstruction

Had your ACL reconstructed and wondering what the road back to sport actually looks like? You're not alone. It's one of the most common sports injuries we see - and one of the most commonly rushed.

Here's what you need to know.

What is ACL reconstruction?

The ACL (anterior cruciate ligament) is a key stabilising ligament inside the knee. When it tears, surgery is often needed to replace it with a graft - usually taken from your own hamstring, patella tendon or quad tendon.

The surgery is straightforward. The rehab is where the real work happens.

How long does recovery take?

Most people need 9 to 12 months before returning to competitive sport. Sometimes longer.

Here's something a lot of people don't realise: the graft is actually at its weakest in the early months after surgery. It goes through a process of remodelling and strengthening over time - which is why rushing back is risky, even if the knee feels fine.

Time is part of the equation, but it's not the whole story. You also need to hit certain physical and mental milestones before returning.

The phases of rehab

Think of recovery in stages, each building on the last:

•  Weeks 1–6: Get the swelling down, restore full straightening of the knee, start activating the quads and get walking normally

•  Weeks 6–16: Build strength in the quads, hamstrings, glutes and calves - single-leg work becomes a big focus here

•  Months 4–6: Graduated return to running, then adding in change of direction at lower speeds

•  Months 6–9+: Sport-specific drills - cutting, jumping, pivoting, landing. Reintegrating into team training gradually

•  9–12+ months: Full return to sport, based on testing - not just how the knee feels

How do we know when you're ready?

This is the big one. We don't just go by time - we test you.

Before clearing someone to return to sport, we look at:

•  Leg strength - your operated leg should be within 90% of your other leg

•  Hop tests - single-leg hopping for distance and speed, compared side to side

•  Movement quality - how you land, squat and change direction

•  Running - can you sprint without pain, swelling or hesitation?

•  Confidence - do you actually trust the knee?

That last one matters more than people think.

What about the mental side?

Fear of re-injury is one of the biggest reasons people don't get back to their pre-injury level of sport - even when the knee is physically ready.

It's completely normal to feel anxious. Part of the rehab process is gradually building that confidence back up through exposure, testing and honest conversations about how you're feeling.

What's the risk of re-injury?

Around 1 in 6 people re-injure their ACL - either the same knee or the other one. The risk is highest when people return too soon or skip the later stages of rehab.

Doing the full program, meeting the criteria and not cutting corners is the best thing you can do to protect yourself long term.

When should you see a physio?

Ideally within the first week or two after surgery - and then consistently throughout the whole rehab process.

If you're already in recovery and feel like you've stalled, haven't done any proper testing, or just aren't sure whether you're ready to return - come in to Urban Physiotherapy for a review. We can tell you exactly where you're at and what needs to happen next.