# Going back after an injury: the knee heals before the head does

> After ACL reconstruction 81% go back to playing sport, but only 55% go back to competitive level — and many of those who never return have a knee that works fine. Psychological readiness can be measured, it predicts return, and in under-20s it is associated with the risk of a second injury. What the numbers say about the calendar, about criteria and about girls, and what a coach can actually say on the day someone comes back.

**In short:** Because tissue heals faster than confidence: after ACL reconstruction 81% go back to playing sport but only 55% return to competitive level, and among those who do not return, fear of reinjury is one of the most common reasons (Ardern et al., 2014, a meta-analysis of 7,556 participants, mostly adults).

- Page: https://www.babsport.com/en/blog/ritorno-allo-sport-dopo-infortunio
- Markdown source: https://www.babsport.com/en/blog/ritorno-allo-sport-dopo-infortunio.md
- Published: 2026-08-16
- Updated: 2026-08-16
- Author: Sajid Hossain
- Publisher: BAB — Breaking All Barriers (https://www.babsport.com/)
- Tag: return to sport, psychological readiness, ACL, second injury, prevention
- How to cite: BAB — Breaking All Barriers, "Going back after an injury: the knee heals before the head does", https://www.babsport.com/en/blog/ritorno-allo-sport-dopo-infortunio
- Note: educational content, not medical advice. Every health claim is anchored to a source listed under "Sources"; where a study was run on adults, the text says so.

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There is a moment in an injured athlete's pathway that appears in no medical record: the one where the knee has healed, the check-ups are fine, the physiotherapist's job is done — and out on the pitch she does not trust it. This is not a sentimental detail. It is the part of recovery with the worst numbers.

> **In brief**
> - After ACL reconstruction, **81%** go back to sport, **65%** to their preinjury level, **55%** to competitive sport (Ardern et al., 2014; **mostly adult** sample).
> - **Fear of reinjury** remains prominent precisely at the point of return, and can prevent it altogether (Ardern et al., 2013).
> - Psychological readiness can be **measured** (the ACL-RSI scale) and, in **under-20s**, lower scores at 12 months are associated with a second injury (McPherson et al., 2019).
> - Delaying return **up to nine months** cut the reinjury rate by 51% per month; beyond nine months, no further reduction (Grindem et al., 2016).
> - Among those **under 25** who return to sport, the second ACL injury rate is **23%** (Wiggins et al., 2016).
> - Return is a **shared, staged decision**, not a green light switched on by one person (Ardern et al., 2016).

## How many athletes really return to their previous level?

**About four in five go back to playing sport, but only just over half return to competition.** The gap does not open during rehabilitation: it opens afterwards, when the body is technically fine.

The most cited estimate comes from a systematic review with meta-analysis of **69 studies and 7,556 participants** after anterior cruciate ligament reconstruction: **81%** returned to sport in some form, **65%** to their preinjury level, **55%** to competitive sport ([Ardern et al., 2014](https://doi.org/10.1136/bjsports-2013-093398)).

One caveat has to come immediately, because it changes how the number should be read: that sample is **mostly adult**. It is not a prevalence measured in 15-year-olds and should not be passed off as one. What remains valid is the shape of the phenomenon — between "can play" and "plays like before" there is a wide gap, and that gap is not made of tissue.

## Why do people who have healed not go back?

**Because the risk of getting hurt again is real, and the fear that comes with it does not heal alongside the ligament.** A systematic review of psychological factors associated with return concludes that positive psychological responses are associated with a higher rate of returning to sport after injury, and that fear remains prominent at the moment of return, to the point of preventing it ([Ardern et al., 2013](https://doi.org/10.1136/bjsports-2012-091203)).

It is worth saying plainly to coaches and parents: **that fear is not irrational**. As the figures below show, the risk of a second injury in a young athlete who returns is far from negligible. The adults' job is not to convince a girl there is nothing to fear — it is to genuinely reduce the risk, and in the meantime not to leave her to manage it alone.

It is the same mechanism we described in [how pain changes during puberty](/en/blog/dolore-in-puberta-neuroscienza): a signal dismissed as "in the head" is almost always a signal nobody has measured yet.

## Can psychological readiness be measured?

**Yes, with a validated scale: the ACL-RSI.** It measures three dimensions — emotions around returning, confidence in one's own performance, and the subjective appraisal of reinjury risk.

Two findings make it more than a courtesy questionnaire:

- In a cohort of athletes after ACL reconstruction, the **preoperative** score and the score at **4 months** predicted return to preinjury level at 12 months ([Ardern et al., 2013](https://doi.org/10.1177/0363546513489284)).
- In a study of **329 patients** who returned to sport after reconstruction, 52 (16%) sustained a second ACL injury. Among **under-20s**, those who were injured again had significantly lower psychological readiness at 12 months: **60.8 vs 71.5 points** (P = .02). In older patients the difference did not appear ([McPherson et al., 2019](https://doi.org/10.1177/0363546518825258)).

How to read this — and how **not** to. It is an association observed in a cohort, not proof that raising a score lowers the risk; and it is not a tool a coach can use to decide who plays. It is one more piece of information a healthcare professional places alongside the others — strength, symmetry, functional tests — when the question "is she ready?" actually arrives.

## Coming back: the calendar or the criteria?

**Both, in this order: minimum time first, then criteria — and the criteria are not optional.**

In the Delaware-Oslo prospective cohort, **106 patients** after ACL reconstruction who played pivoting sports were followed for two years:

- those who returned to **level I** sports had a reinjury rate **4.32 times** higher than those who did not (P = .048);
- the reinjury rate fell by **51% for each month** return was delayed **up to nine months** after surgery; beyond nine months no further reduction was observed;
- **38.2%** of those who failed the return-to-sport criteria were reinjured, versus **5.6%** of those who passed — a wide difference which, in this study, **did not reach statistical significance** (HR 0.16; P = .075);
- **more symmetrical quadriceps strength** before returning significantly reduced the reinjury rate ([Grindem et al., 2016](https://doi.org/10.1136/bjsports-2016-096031)).

There is also a sharper figure on the weight of criteria, but it must be quoted with its population attached: in **158 adult male professional athletes**, failing to meet six discharge criteria before returning was associated with a **fourfold** risk of graft rupture. In the same group 26 athletes (16.5%) ruptured their graft an average of **105 days** after returning ([Kyritsis et al., 2016](https://doi.org/10.1136/bjsports-2015-095908)). The principle — you return on tests passed, not on days elapsed — holds; the numerical estimate does not transfer to a 16-year-old.

These data make one error obvious: **treating the date of surgery as the date of return**. Time serves the tissue, tests serve the decision. Neither is enough on its own.

## How high is the risk of a second injury in young athletes?

**High enough to justify caution, and higher precisely in the age group we are concerned with.**

A meta-analysis on secondary injury risk reports an overall rate of **15%** (7% on the same knee, 8% on the contralateral one), rising to **21%** in patients under 25, 20% in those who return to sport, and **23%** when the two conditions combine — that is, **nearly one in four** among those under 25 who go back ([Wiggins et al., 2016](https://doi.org/10.1177/0363546515621554)).

The figure closest to our athletes comes from a prospective cohort of **78 athletes with a mean age of 17.1**, followed for 24 months after returning:

- **29.5%** sustained a second ACL injury within two years: **20.5%** to the opposite knee, **9.0%** to the reconstructed one;
- the overall rate was nearly **6 times** that of never-injured peers (IRR 5.71; 95% CI 2.0-22.7);
- for the **girls** who had surgery, the rate was **4.51 times** that of never-injured female controls (95% CI 1.5-18.2);
- the more exposed knee in girls was the **contralateral** one (23.7% vs 10.5% in boys), though on this point the authors explicitly describe a **non-significant trend** (P = .18) ([Paterno et al., 2014](https://doi.org/10.1177/0363546514530088)).

Two honest caveats. The sample is small, so these numbers are an order of magnitude rather than any individual athlete's personal probability. And the practical consequence is not to stop: it is that the [neuromuscular work that prevents the first injury](/en/blog/crociato-giovani-atlete) should not be filed away once rehabilitation ends — it is exactly what is still needed, and it concerns **both** knees, not one.

## What the international consensus says about returning

The reference document is the **Bern 2016** consensus statement, and it contains two ideas that change how the conversation goes ([Ardern et al., 2016](https://doi.org/10.1136/bjsports-2016-096278)).

First: return to sport is not a switch, it is a **three-step continuum**.

| Step | What it means |
| --- | --- |
| Return to participation | The athlete is training but is not yet ready to compete |
| Return to sport | She is back in her sport, not necessarily at the level she wants |
| Return to performance | She is back at or beyond her previous level |

Second: the decision is **shared** between athlete, medical staff and coaches, and weighs tissue status, the risk of the sporting movement and the context — it is not one person's verdict.

A note on the evidence, for transparency: most of the numbers in this article concern the **ACL**, simply because it is the most studied injury. For an ankle, a shoulder or low back pain the absolute values are different and often missing; the principle — verified steps, criteria before the calendar, a shared decision — does carry across. For [ankle sprains](/en/blog/distorsione-caviglia-giovani-atlete) and [low back pain](/en/blog/mal-di-schiena-giovani-atlete) we have described what is known, and where the evidence stops.

## What the people around the athlete can do

None of this requires clinical expertise, and all of it shortens the distance between the three steps.

- **Coaches**: say before the session what today will involve ("ball work only, no contact"), drop comparisons with "before", do not ask for a demonstration in the first session. And remember that [words said on the sideline](/en/blog/parole-allenatore-salute-atlete) stick around far longer than the medical report.
- **Families**: separate "how is the knee" from "how are you". These are two recoveries, and they move at different speeds.
- **Clubs**: do not treat return as a private matter between the athlete and her physiotherapist. Whoever manages load on the pitch is part of the decision.
- **The athlete**: being able to say "I don't feel up to cutting today" without it becoming an issue. That is useful information for the staff, not a surrender.

And one thing **nobody** should do: use the return as a test of character. Courage is not a discharge criterion.

## BAB's role

BAB does not decide who can return and does not replace any professional. It helps the athlete privately observe her own signals — energy, pain, sleep, confidence — during the period when everyone is looking only at the knee, and to take them, if she wants, to the people treating her. Clubs receive **only aggregated, anonymous signals**. Because in the month when a girl decides whether she is really going back, the most useful information is often not in a scan.

## Frequently asked questions

### How many athletes actually return to their previous level after a serious injury?

Fewer than you would expect, and the gap opens up after healing, not during it. A systematic review with meta-analysis of 69 studies and 7,556 participants who had ACL reconstruction reports that 81% went back to playing sport in some form, 65% returned to their preinjury level and 55% returned to competitive sport (Ardern et al., 2014). One caveat matters: that sample is mostly adult, so the figure is not a prevalence measured in 15-year-olds. What holds is the shape of the curve — between 'can play' and 'plays like before' there is a wide gap, and it is not made of tissue.

### Why is there still fear of reinjury when the knee has healed?

Because the risk is real, and the fear that comes with it does not heal alongside the ligament. A systematic review of the psychological factors associated with returning to sport concludes that positive psychological responses are associated with a higher rate of returning after injury, and that fear remains prominent precisely at the point of return, to the extent of preventing it altogether (Ardern et al., 2013). This is not fragility or poor motivation: it is the part of recovery almost nobody talks about, and the one the people around the athlete can influence straight away.

### Can psychological readiness be measured?

There is a validated scale, the ACL-RSI, and it measures three things: emotions, confidence in performance and the appraisal of reinjury risk. In a cohort of athletes who had ACL reconstruction, preoperative and 4-month scores predicted return to preinjury level at 12 months (Ardern et al., 2013). In a later cohort of 329 patients who returned to sport, under-20s who went on to sustain a second injury had significantly lower psychological readiness at 12 months (60.8 vs 71.5 points; P = .02) (McPherson et al., 2019). How to read it: this is an observed association, not a test that decides who plays, and it belongs in a healthcare professional's overall assessment.

### How many months before you can play again?

Time matters, but on its own it is not a criterion. In the Delaware-Oslo prospective cohort of 106 patients after ACL reconstruction, the reinjury rate fell by 51% for each month return to sport was delayed up to nine months after surgery, with no further risk reduction beyond nine months (Grindem et al., 2016). In the same study, those who returned to level I sports had a 4.32 times higher reinjury rate than those who did not. The calendar tells you when it is reasonable to start assessing — not that someone is ready. The decision is clinical and shared with whoever is treating the athlete.

### How high is the risk of a second injury for a 15-17 year old girl?

Higher than for an adult athlete, which is exactly why this age group deserves extra caution. A meta-analysis reports a second ACL injury rate of 15% overall, rising to 21% in patients under 25 and 23% among those under 25 who return to sport (Wiggins et al., 2016). In a prospective cohort of 78 athletes with a mean age of 17.1, 29.5% sustained a second ACL injury within 24 months of returning: 20.5% to the opposite knee and 9.0% to the reconstructed one. For the girls the rate was 4.51 times that of never-injured peers, and the more exposed knee was the contralateral one (Paterno et al., 2014). These are small samples: read them as an order of magnitude, not as a personal probability.

### What can a coach say to an athlete who is coming back?

A few sentences, none of which put her on trial. Three things almost always help: saying in advance what today will involve ('ball work only, no contact'), dropping comparisons with 'before', and not asking for proof in the first session. The Bern international consensus describes return to sport as a three-step continuum — return to participation, return to sport, return to performance — and as a shared decision between athlete, staff and clinicians, not a green light switched on by one person (Ardern et al., 2016). Shortening the distance between those three steps is precisely a coach's job.

### What is the difference between returning to training and returning to play?

They are two different steps of the same pathway, and confusing them is one of the commonest mistakes. The 2016 Bern consensus distinguishes return to participation (the athlete is training but not yet ready to compete), return to sport (back in her sport, not necessarily at the level she wants) and return to performance (back at or above her previous level) (Ardern et al., 2016). Saying it out loud changes everyone's expectations: a girl training with the team is not 'coming back slowly', she is exactly where the pathway places her.

### Does returning after a concussion follow the same rules?

No — it has its own, stricter protocol and should not be confused with return after a joint injury. After a concussion the Amsterdam 2022 international consensus sets out 24-48 hours of relative rest, four return-to-learn steps and six return-to-sport steps of at least 24 hours each, with full return to school before unrestricted return to sport and final clearance resting with a healthcare professional (Patricios et al., 2023). The one principle both pathways share: you progress through verified steps, not through days on a calendar.

### Is passing the physical tests enough to return safely?

It helps a lot, but it does not remove the risk — and the data deserve to be reported in full. In the Delaware-Oslo cohort, 38.2% of those who failed the return-to-sport criteria suffered a reinjury versus 5.6% of those who passed: a large difference which nevertheless did not reach statistical significance in that study (HR 0.16; P = .075) (Grindem et al., 2016). In a study of 158 adult male professional athletes, not meeting six discharge criteria before returning was associated with a fourfold risk of graft rupture; 26 of the 158 (16.5%) ruptured their graft an average of 105 days after returning, criteria met included (Kyritsis et al., 2016). That sample is male, adult and professional: the principle of criteria holds, the numerical estimate does not transfer to a 16-year-old.

## Sources

- Ardern C.L., Taylor N.F., Feller J.A., Webster K.E. **Fifty-five per cent return to competitive sport following anterior cruciate ligament reconstruction surgery: an updated systematic review and meta-analysis including aspects of physical functioning and contextual factors.** *British Journal of Sports Medicine*, 2014;48(21):1543-1552. (69 studies, 7,556 participants; 81% returned to any sport, 65% to preinjury level, 55% to competitive level; **mostly adult** sample) [doi:10.1136/bjsports-2013-093398](https://doi.org/10.1136/bjsports-2013-093398)
- Ardern C.L., Taylor N.F., Feller J.A., Webster K.E. **A systematic review of the psychological factors associated with returning to sport following injury.** *British Journal of Sports Medicine*, 2013;47(17):1120-1126. (systematic review; positive psychological responses are associated with returning, fear remains prominent at the point of return) [doi:10.1136/bjsports-2012-091203](https://doi.org/10.1136/bjsports-2012-091203)
- Ardern C.L., Taylor N.F., Feller J.A., Whitehead T.S., Webster K.E. **Psychological responses matter in returning to preinjury level of sport after anterior cruciate ligament reconstruction surgery.** *The American Journal of Sports Medicine*, 2013;41(7):1549-1558. (preoperative and 4-month ACL-RSI scores predict return to preinjury level at 12 months) [doi:10.1177/0363546513489284](https://doi.org/10.1177/0363546513489284)
- McPherson A.L., Feller J.A., Hewett T.E., Webster K.E. **Psychological Readiness to Return to Sport Is Associated With Second Anterior Cruciate Ligament Injuries.** *The American Journal of Sports Medicine*, 2019;47(4):857-862. (cohort study, level of evidence 2; 329 patients returned to sport, 52 second injuries; in **under-20s** 60.8 vs 71.5 ACL-RSI points at 12 months, P = .02) [doi:10.1177/0363546518825258](https://doi.org/10.1177/0363546518825258)
- Grindem H., Snyder-Mackler L., Moksnes H., Engebretsen L., Risberg M.A. **Simple decision rules can reduce reinjury risk by 84% after ACL reconstruction: the Delaware-Oslo ACL cohort study.** *British Journal of Sports Medicine*, 2016;50(13):804-808. (prospective cohort of 106 patients; returning to level I sport 4.32 times the reinjury rate; −51% per month of delay up to 9 months; 38.2% vs 5.6% for failing vs passing criteria, **HR 0.16; P = .075, not significant**) [doi:10.1136/bjsports-2016-096031](https://doi.org/10.1136/bjsports-2016-096031)
- Kyritsis P., Bahr R., Landreau P., Miladi R., Witvrouw E. **Likelihood of ACL graft rupture: not meeting six clinical discharge criteria before return to sport is associated with a four times greater risk of rupture.** *British Journal of Sports Medicine*, 2016;50(15):946-951. (158 **adult male professional** athletes; 26 graft ruptures, 16.5%, an average of 105 days after return) [doi:10.1136/bjsports-2015-095908](https://doi.org/10.1136/bjsports-2015-095908)
- Wiggins A.J., Grandhi R.K., Schneider D.K., Stanfield D., Webster K.E., Myer G.D. **Risk of Secondary Injury in Younger Athletes After Anterior Cruciate Ligament Reconstruction: A Systematic Review and Meta-analysis.** *The American Journal of Sports Medicine*, 2016;44(7):1861-1876. (overall rate 15%: 7% ipsilateral, 8% contralateral; 21% under 25; **23%** under 25 and returned to sport) [doi:10.1177/0363546515621554](https://doi.org/10.1177/0363546515621554)
- Paterno M.V., Rauh M.J., Schmitt L.C., Ford K.R., Hewett T.E. **Incidence of Second ACL Injuries 2 Years After Primary ACL Reconstruction and Return to Sport.** *The American Journal of Sports Medicine*, 2014;42(7):1567-1573. (78 athletes after reconstruction, **mean age 17.1**, and 47 controls; 29.5% second injuries within 24 months; in girls IRR 4.51 vs female controls; higher contralateral risk reported as a **non-significant trend**, P = .18) [doi:10.1177/0363546514530088](https://doi.org/10.1177/0363546514530088)
- Ardern C.L., Glasgow P., Schneiders A., et al. **2016 Consensus statement on return to sport from the First World Congress in Sports Physical Therapy, Bern.** *British Journal of Sports Medicine*, 2016;50(14):853-864. (consensus statement by 17 expert clinicians; three-step continuum and shared decision-making) [doi:10.1136/bjsports-2016-096278](https://doi.org/10.1136/bjsports-2016-096278)
- Patricios J.S., et al. **Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport, Amsterdam, October 2022.** *British Journal of Sports Medicine*, 2023;57(11):695-711. [doi:10.1136/bjsports-2023-106898](https://doi.org/10.1136/bjsports-2023-106898)

*This article is for information only and does not constitute medical advice. The decision to return after an injury rests with the athlete together with the healthcare professionals treating her.*