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1 in 5 Athletes Suffer a Second ACL Injury: Signs & Recovery Tips

Updated: Oct 30, 2025




This is a really significant stat: and this is not just re-injury of their affected side if they’ve undergone surgery, but also can be injury of their OTHER knee. 

For us, this really highlights two big things.


Firstly – that there’s LOTS of different factors that contribute to ACL injury, & that even with surgery to repair or replace the ligament, this doesn’t address these factors.  Our strength, our movement patterns, our control – these are big ticket items, and need to be thoroughly addressed in order to safely return.


Secondly – There’s no margin for error with cutting corners in rehab. 20% of athletes suffer a second ACL injury. This is far too high, and cutting corners – whether it be looking to return to sport too soon, or not going through every step in the process – only heightens that risk.


What Are the Signs and Symptoms of an ACL Injury?


Recognising ACL injury symptoms early can help prevent further damage and start timely rehabilitation. Common signs include:


  • A loud “pop” at the time of injury

  • Sudden knee pain and swelling

  • Instability or “giving way” of the knee

  • Reduced range of motion

  • Difficulty bearing weight or walking


How long does it take to recover from an ACL Injury?


Recovering from an ACL injury requires time, patience, and a structured rehabilitation plan to ensure a safe return to activity.


  • ACL injury recovery time depends on the severity of the injury and whether surgery is needed.

  • Typical recovery ranges from 6 to 12 months before returning to sport safely.

  • A structured rehabilitation program is essential, focusing on:

    • Strengthening key muscles

    • Improving knee stability and control

    • Gradually progressing activity and sport-specific drills


If you’ve injured your knee, and are wanting to get back to sport, speak to us about what things you need to be doing to give yourself the best chance of being in the 80%, and how we can help you achieve a successful return to sport.


(Source: Barber-Westin & Noyes 2020)


Mat Prior

Sports Physiotherapist



 
 
 

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