ACL injuries are among the most common serious knee injuries in sport, particularly in young athletes who play pivoting sports such as AFL, soccer, basketball and netball. After an ACL reconstruction, the big question is when it is safe to return to sport.
Returning to sport depends on more than time. Physical recovery, psychological readiness and, in some young athletes, additional procedures during surgery can all influence the risk of re-injury. [1] [2] [4]
At a Glance
- The risk of re-injury after ACL reconstruction is highest in young athletes returning to pivoting sports.
- In one study of adolescents, adding a lateral extra-articular procedure (LEAP) was associated with fewer graft re-ruptures (2.5% compared with 13.6%).
- Psychological readiness, including confidence and fear of re-injury, is linked to whether people return to sport.
- Return to sport should be based on criteria such as strength, movement and confidence, not just time.
- Most surgeons recommend waiting at least 9–12 months before full competitive sport.
Why do ACL injuries matter for athletes?
The anterior cruciate ligament (ACL) is a key ligament that stabilises the knee during movement. It is often injured during sudden stops, changes of direction or landings, such as in AFL, soccer, basketball and skiing. ACL injuries in adolescents playing competitive sport have become more common. [3]
An ACL injury can significantly disrupt an athlete’s season and involves a long recovery. Despite advances in surgery, re-injury remains a concern, which is why the decision about when to return to sport is so important.
Can an extra procedure during surgery reduce re-injury?
A lateral extra-articular procedure (LEAP), such as a lateral tenodesis, adds rotational control on the outer side of the knee.
In a matched study of adolescents having ACL reconstruction, the graft re-rupture rate was 2.5% in those who also had a LEAP, compared with 13.6% in those who had an ACL reconstruction alone. The LEAP group also had higher activity scores on the Tegner scale (7.2 compared with 6.3). [4]
This was not a randomised trial, so other differences between the groups may have contributed. Not every patient needs a LEAP, and the decision depends on your age, sport, laxity and examination findings.
Why does psychological readiness matter?
Psychological readiness is often measured with the ACL Return to Sport after Injury (ACL-RSI) scale, where higher scores mean more confidence and less fear of re-injury.
A review of more than 3,700 patients found that people who returned to sport after ACL reconstruction had significantly higher psychological readiness than those who did not. [5] Fear of re-injury is also linked to how and whether athletes return to sport. [1] [2]
Physical competence and psychological response are connected. Young athletes who perform better on physical tests tend to feel more ready to return. [6] A structured rehabilitation program that addresses both strength and confidence is therefore important.
What does this mean for your recovery?
These studies highlight the value of a comprehensive rehabilitation program that addresses both physical and psychological recovery. Return to sport should be based on objective criteria, such as strength, hop and agility testing, along with confidence, rather than time alone. [3] You can read more in Return to Play Testing After ACL Reconstruction.
In young and active patients at higher risk of re-injury, an additional procedure such as a LEAP may be worth discussing with your surgeon.
Summary
Returning to sport after ACL reconstruction depends on physical recovery, psychological readiness and, for some young athletes, additional procedures that may reduce re-injury. A rehabilitation program that addresses both strength and confidence, followed by criteria-based testing, gives you the best chance of a safe return to your sport.
If you would like to discuss how this applies to your knee, you can book a consultation with Dr Vishal Pai.
References
Show all 6 referencesHide references
- Caumeil Q et al. 2024. Reinjury anxiety and return to sport after anterior cruciate ligament reconstruction: a cluster analysis and prospective study among 162 athletes. The American Journal of Sports Medicine.
- Cronström A et al. 2023. Factors associated with sports function and psychological readiness to return to sports at 12 months after anterior cruciate ligament reconstruction: a cross-sectional study. The American Journal of Sports Medicine.
- Lorange JP et al. 2024. Return to sport after pediatric anterior cruciate ligament reconstruction: a systematic review of the criteria. The American Journal of Sports Medicine.
- Moussa MK et al. 2024. Impact of lateral extra-articular procedure augmentation on rerupture risk and Tegner activity scale outcomes in adolescent anterior cruciate ligament reconstruction: a matched comparative study with a minimum 2-year follow-up. The American Journal of Sports Medicine.
- Xiao M et al. 2022. Patients who return to sport after primary anterior cruciate ligament reconstruction have significantly higher psychological readiness: a systematic review and meta-analysis of 3744 patients. The American Journal of Sports Medicine.
- Zwolski C et al. 2023. The association of physical competence with psychological response among young athletes at time of return to sport after ACL reconstruction. The American Journal of Sports Medicine.
Frequently Asked Questions
How long after an ACL tear should I have surgery?
There is no strict deadline, but most surgeons recommend waiting until swelling and inflammation have settled and some quadriceps strength has returned. This is often 4 to 6 weeks after the injury. Operating on an inflamed, stiff knee increases the risk of stiffness after surgery. Delaying surgery beyond a few months does not usually worsen the surgical result, although the risk of further damage to the knee increases over time.
What graft is used to reconstruct the ACL?
The most common grafts are the hamstring tendons and the patellar tendon (bone-patellar tendon-bone). The quadriceps tendon is another option. The choice depends on your activities, anatomy and the surgeon’s assessment, and it is worth discussing each option at your consultation.
Can I return to sport after ACL reconstruction?
Many people return to their pre-injury sport after ACL reconstruction, but not everyone does. Return to sport should be based on specific criteria, not just time, including strength testing, movement assessments and psychological readiness. Most surgeons recommend waiting at least 9 to 12 months before returning to full competitive sport.
What happens if I don't have surgery and my knee gives way again?
Each episode of instability increases the risk of further damage to the meniscus and cartilage. This damage can be harder to treat than the original ACL tear and may lead to earlier arthritis. This is one reason surgery is often recommended for active people who play pivoting sports.
Is ACL repair different from reconstruction?
Yes. Reconstruction replaces the torn ligament with a tendon graft. Repair stitches the original ligament back to the bone and is only suitable for specific tear patterns, usually tears close to the thighbone in younger patients with good tissue quality. It is considered only after a careful review of the MRI and examination.
Planning your return to sport after an ACL injury?
Dr Vishal Pai performs ACL reconstruction and can discuss your surgery, rehabilitation and realistic timeframes for returning to sport. You can arrange a consultation to talk about your injury and goals.
Written by Dr Vishal Pai
Vishal is an experienced knee surgeon based in Bayside, Melbourne. He consults at Sandringham Orthopaedic Specialists and operates at The Avenue Hospital and Calvary Holmesglen Private Hospital. His practice focuses on sports knee surgery, including ACL reconstruction and meniscal repair, as well as robotic knee replacement.