Why is ACL recovery so long?
Mia Kelly
Published Jan 15, 2026
Like all ligaments, the ACL takes a very long time to heal. The reason is because ligaments are poorly vascularized. In other words, there aren't many blood vessels to provide nutrients for the ligaments, and without nutrients, tissue repair is not possible. Oftentimes, ACL tears require a surgical graft.
Why is ACL surgery recovery so long?
Why is the ACL recovery period so long? The reason for this is due to the biological changes which the graft will need to undergo in order to re-incorporate into the body. Once a graft is disconnected from the body, even for a short time, the cells within it undergo necrosis (i.e. die).
How long does the average ACL recovery take?
Results. Successful ACL reconstruction paired with focused rehabilitation can usually restore stability and function to your knee. Within the first few weeks after surgery, you should strive to regain a range of motion equal to that of your opposite knee. Recovery generally takes about nine months.
What is the fastest ACL recovery time ever?
This all happened 173 days or 24½ weeks after tearing his ACL during a spring football practice on March 25. The six-month anniversary of the injury was this Wednesday. That was the earliest date trainers had originally scheduled for him to return… to practice.
Do you ever fully recover from a torn ACL?
Thirty years ago, an ACL injury was career-ending, but today, thanks to arthroscopy and refined surgical techniques, most athletes are able to return to sports. Happily, the answer to the above question is most likely a yes – but with qualifications.
28 related questions foundWill my knee ever be the same after ACL tear?
In this study, the authors take a look at knee joint range-of-motion 10 to 14 years after ACL reconstruction. They found that even a small decrease in knee motion (flexion or extension) can make a big difference in the final results.
Will your knee ever be the same after ACL surgery?
Almost every patient I have ever met believes that their knee will be the same after surgical ACL tear recovery. The ACL is a major stabilizer of the knee and often injured in sports. Most patients believe that when they injure their ACL ligaments, they can just get a new one-no harm no foul.
When is ACL repair most vulnerable?
First two weeks after surgery
This phase is the most important during ACL recovery because it is precisely during this time that the knee is most vulnerable.
When did Amari Rodgers tear his ACL?
– On March 25, 2019, Clemson receiver Amari Rodgers suffered a torn ACL during spring practice. Exactly 760 days later, he was selected in the third round of the 2021 NFL Draft by the Green Bay Packers. It's what happened in between that is absolutely astounding.
How fast did AP come back from ACL?
Look at Adrian Peterson – he's the best running back in the NFL, and he was back in nine months. Peterson, the star running back for the Vikings, understands that his unprecedented recovery changed the game. "I know with 'D.
How long after ACL surgery will my knee feel normal?
You should soon start seeing improvement in your knee. You may be able to return to most of your regular activities within a few weeks. But it will be several months before you have complete use of your knee. It may take as long as 6 months to a year before your knee is ready for hard physical work or certain sports.
How can I speed up my ACL recovery?
Tips for Healing Faster after ACL Surgery
- Physical therapy. A physical therapy program designed specifically for you will help you recover function, mobility, and strength. ...
- Cryotherapy. ...
- Bracing. ...
- Rest.
Why does my knee still hurt a year after ACL surgery?
But even after reconstruction surgery, instability of the knee may still be an issue. Typically, this happens due to a surgical error or an undiscovered injury that occurred in or around the knee at the time of the ACL tear.
Is it easy to Retear ACL after surgery?
Every surgically reconstructed anterior cruciate ligament can retear. The risk ranges from one or two percent to more than 20 percent. The replacement ligament (graft) chosen for your surgery can significantly increase or decrease your chance of a retear.
Why do knee injuries take so long to heal?
If you hit your kneecap against something hard and it doesn't break, the bursa can bleed and swell. This area takes a lot longer to heal than a normal bruise and is most often improved over time, so treatment may be more for symptom relief. Additionally, it doesn't take a hard blow to the knee to become injured.
When is ACL graft the weakest?
The graft is at its weakest at 3 to 6 months – just when the patient is beginning to regain confidence. It is therefore essential that return to proper sport is delayed until 9 months post-op.
How long until you can play sport after ACL surgery?
Following an ACL injury, it is estimated that athletes should be able to return to sport within nine months of surgery.
Can I drive with an ACL injury?
When can you start driving after ACL surgery? You are not fit to drive until six weeks, with the exception that if you had a left knee ACL reconstruction, you can drive an automatic after three weeks.
Can an ACL graft stretch?
When there is no medial meniscus, an ACL graft would be at risk for stretching out. Meniscal root tears can also cause an ACL graft to stretch out, and missed, or unrecognized, posterolateral corner or medial collateral ligament (MCL) tears can also cause an ACL graft to stretch out.
Is new ACL stronger?
Ultimately this graft (and all implanted grafts) loses about half its strength so that its ultimate strength, based on animal studies, is estimated to be about 1.2 times stronger than the original ACL.
Can you live without an ACL?
Without an ACL, the knee is unlikely to support aggressive landing, cutting and pivoting. Living with a torn ACL may mean limiting participation in sports, work and activities that cause the knee to swell, give way or feel unstable. Risk of other injuries. The ACL restrains the thigh and shinbone in the knee.
How successful is ACL repair?
ACL reconstruction surgery has a success rate of 80-90%. However, that leaves an unacceptable number of patients that have unsatisfactory results. Eight percent of these poor results are thought to be due to knee instability or re-rupture of the ACL graft.
Why is the ACL so weak?
This vulnerability is due to the anatomy of the hips and knees and a lack of muscle support structures to protect the ACL from experiencing high levels of strain during jumping, landing or cutting movements.
What sport has the most ACL injuries?
However, of the 9 sports studied, football had the largest number of ACL injuries and the highest competition-related ACL injury rate. Athletes were 7 times more likely to sustain ACL injuries in competition than in practice. Overall, 76.6% of all ACL injuries resulted in surgery.
Why are ACL tears so common now?
As with any sport or activity, the more you practice and play it, the greater the risk of injury. Today's prevalence of ACL tears is partially attributable to increased training, practice, and playing time which places a far too heavy workload on an athlete's body.