ACL Return to Sport after Injury Scale
Also known as: ACL-RSI
The ACL-Return to Sport after Injury (ACL-RSI) Scale is a 12-item patient-reported outcome instrument designed to measure the psychological impact and readiness to return to sport following anterior cruciate ligament injury and reconstruction. Developed by Webster, Feller, and Lambros in 2008 and published in the British Journal of Sports Medicine, the ACL-RSI addresses a critical gap in ACL rehabilitation assessment by quantifying psychological barriers to sport resumption—emotions, confidence in the knee, and risk appraisal—which are often more limiting than physical recovery.
Key highlights
- Excellent test–retest reliability (ICC 0.89–0.94) and internal consistency (Cronbach α 0.87–0.91); psychometrically sound across multiple languages and populations.
- Addresses the 'missing link' in ACL rehabilitation: psychological barriers that prevent return to sport despite physical readiness; strong predictor of actual sport return at 6–12 months (better than physical tests alone).
- Three-subscale structure allows targeted intervention identification (e.g., if Emotions subscale is low, recommend fear-reduction therapy; if Confidence low, recommend graduated sport-specific training).
- Quick administration (5–10 minutes) and simple 0–10 NRS format; easily integrated into rehabilitation pathways; no special equipment or training required.
Intuition
This section is available to Pro members. Upgrade to Pro
How it works
This section is available to Pro members. Upgrade to Pro
When to use it
The ACL-RSI is indicated for athletes in the latter stages of ACL reconstruction rehabilitation (typically 4+ months post-op), when physical recovery is substantial but psychological readiness is uncertain. Use ACL-RSI when decision-making around return to sport requires understanding of psychological factors beyond physical tests (strength, hop tests, ROM). It is particularly valuable for identifying athletes at high risk of non-return or re-injury due to fear or low confidence, allowing targeted psychological intervention (fear-exposure therapy, cognitive-behavioral therapy, return-to-sport confidence coaching). The ACL-RSI is less useful in acute post-op phases (first 3 months) when psychological responses are still forming.
Strengths & limitations
- Excellent test–retest reliability (ICC 0.89–0.94) and internal consistency (Cronbach α 0.87–0.91); psychometrically sound across multiple languages and populations.
- Addresses the 'missing link' in ACL rehabilitation: psychological barriers that prevent return to sport despite physical readiness; strong predictor of actual sport return at 6–12 months (better than physical tests alone).
- Three-subscale structure allows targeted intervention identification (e.g., if Emotions subscale is low, recommend fear-reduction therapy; if Confidence low, recommend graduated sport-specific training).
- Quick administration (5–10 minutes) and simple 0–10 NRS format; easily integrated into rehabilitation pathways; no special equipment or training required.
- Measures only psychological readiness; does not assess physical capacity (strength, power, proprioception). Must be paired with objective physical testing (isokinetic strength, hop tests, Y-balance) for comprehensive return-to-sport decision-making.
- Scores may be influenced by recent re-injury or negative sport experience; temporal context matters (administer at consistent point in rehabilitation, e.g., 6 months post-op).
- Cutoff score (<56) is based on group-level data; individual decision-making should integrate ACL-RSI with clinical judgment, physical measures, sport demands, and athlete preferences.
- Limited for non-ACL injuries; while conceptually applicable to other sport injuries, validation data are primarily from ACL populations.
Common pitfalls
This section is available to Pro members. Upgrade to Pro
Applications
This section is available to Pro members. Upgrade to Pro
Frequently asked
What does a score of <56 mean, and does it prevent the athlete from returning to sport?
A score <56 indicates significant psychological barriers (high fear, low confidence, or high perceived risk) that require attention. It does NOT mean the athlete cannot return to sport. Instead, it is a signal to provide targeted psychological support: fear-exposure therapy, sport-confidence coaching, or cognitive restructuring. Many athletes with initial ACL-RSI <56 successfully return to sport after 4–8 weeks of additional psychological intervention.
Can I use ACL-RSI for non-ACL injuries (e.g., meniscal repair, ankle ligament injury)?
ACL-RSI items are ACL-specific ('re-injuring your knee', 'give way during sport'). While the psychological construct is relevant to other injuries, validation data are limited outside ACL. Consider ACL-RSI for ACL-specific populations; for other injuries, use generic psychological outcome measures or condition-specific instruments if available.
Should I use ACL-RSI at 3 months post-op or wait until 6 months?
Administration at 3 months is too early; post-op distress and incomplete rehabilitation cloud psychological assessment. Administer at 4–6 months post-op when physical recovery is substantial (e.g., quadriceps strength >90% limb symmetry) and psychological responses have stabilized. If repeat testing is planned, use consistent timing (e.g., always at 6-month intervals).
What is the minimal clinically important change (MCID) on the ACL-RSI?
MCID data are limited; estimated change of 10–15 points on the total score (out of 120) is considered clinically meaningful improvement in psychological readiness. Subscale changes of 5–8 points are notable. Compare change scores against baseline and consider clinical context (e.g., an athlete improving from 45 to 60 has crossed the >56 threshold and is now in the acceptable range).
Sources
- 1.Webster KE, Feller JA, Lambros C. Development and preliminary validation of a scale to measure the psychological impact of returning to sport after anterior cruciate ligament reconstruction surgery. Br J Sports Med. 2008;42(6):893-900.
You have read it. What now?
Cite this page
ScholarGate. (2026, June 3). ACL Return to Sport after Injury Scale. ScholarGate. https://scholargate.app/sports-medicine/acl-return-to-sport-scale