The ACL Quality of Life questionnaire, commonly called the ACL-QOL or QOL-ACL, is an ACL-specific patient-reported outcome measure used to assess how an ACL injury affects symptoms, work, sport, recreation, lifestyle, social and emotional function. It can support ACL injury and ACL reconstruction progress tracking, but it does not diagnose ACL injury, confirm graft status or clear someone for sport on its own.

Introduction

An anterior cruciate ligament injury can affect far more than knee strength, range of motion or hop performance.

Clients may report ongoing concerns about:

• knee confidence
• instability episodes
• sport participation
• work duties
• lifestyle changes
• emotional response
• fear of re-injury
• long-term knee health
• quality of life

The ACL Quality of Life questionnaire, commonly called the ACL-QOL or QOL-ACL, is a patient-reported outcome measure designed specifically for people with ACL-deficient or ACL-reconstructed knees.

It is commonly used for:

• ACL injury monitoring
• ACL reconstruction follow-up
• non-surgical ACL management
• return-to-running planning
• return-to-training monitoring
• return-to-sport reasoning
• long-term quality-of-life tracking
• research and outcome reporting

The ACL-QOL is listed by Mapi Research Trust as the Anterior Cruciate Ligament-Quality of Life Questionnaire and is described as an ACL-specific questionnaire with information available on scoring, copyright, licensing and translations.  

Quick Summary

• Outcome measure: ACL Quality of Life questionnaire
• Abbreviations: ACL-QOL, QOL-ACL
• Body region: Knee
• Condition focus: Anterior cruciate ligament injury
• Type: Patient-reported outcome measure
• Main purpose: Assess ACL-related quality of life
• Common domains: Symptoms and Physical Complaints, Work-Related Concerns, Recreational Activities and Sport, Lifestyle, Social and Emotional Concerns
• Score direction: Higher scores generally indicate better ACL-related quality of life
• Best used for: Baseline assessment, reassessment, ACL injury monitoring and ACL reconstruction follow-up
• Key limitation: ACL-QOL does not diagnose ACL injury, confirm graft integrity or determine return-to-sport clearance on its own

What Is the ACL Quality of Life Questionnaire?

The ACL-QOL is an ACL-specific patient-reported outcome measure.

It was developed to assess the impact of ACL injury on quality of life, rather than only measuring pain or basic knee function.

The questionnaire includes five domains:

• Symptoms and Physical Complaints
• Work-Related Concerns
• Recreational Activities and Sport
• Lifestyle
• Social and Emotional Concerns

The ACL-QOL has been described in post-2000 validation research as a disease-specific patient-reported outcome measure for people with ACL-deficient and ACL-reconstructed knees.  

Why It Is Used

The ACL-QOL is used because ACL injury can affect the client’s life in ways that physical tests may not fully capture.

A client may have improving strength, range of motion and hop testing but still report:

• low trust in the knee
• worry about pivoting
• reduced confidence returning to sport
• frustration with lifestyle changes
• difficulty with work tasks
• fear of re-injury
• reduced social participation
• concern about long-term knee problems

The ACL-QOL can help professionals:

• establish a baseline
• assess ACL-related quality of life
• monitor change over time
• identify domains that remain limited
• guide education and goal setting
• support return-to-sport conversations
• combine quality-of-life data with physical testing
• improve progress tracking in Measurz

The ACL-QOL should support assessment reasoning. It should not be used as a stand-alone diagnostic or clearance measure.

What It Measures

Symptoms and Physical Complaints

This domain may provide context about:

• knee symptoms
• instability concerns
• pain or discomfort
• swelling or physical limitations
• confidence with knee-related movement

Work-Related Concerns

This domain may provide context about:

• difficulty with work duties
• work modification
• confidence at work
• concerns about knee symptoms during occupational tasks

Recreational Activities and Sport

This domain may provide context about:

• sport participation
• running, jumping, cutting or pivoting concerns
• confidence returning to activity
• restrictions in recreational activity
• fear of re-injury during sport

Lifestyle

This domain may provide context about:

• activity choices
• routine changes
• restrictions in daily life
• long-term participation concerns

Social and Emotional Concerns

This domain may provide context about:

• worry
• frustration
• confidence
• emotional impact
• social participation
• perceived quality-of-life burden

The ACL-QOL does not directly measure:

• ACL integrity
• graft healing
• knee laxity
• meniscal status
• cartilage status
• quadriceps strength
• hamstring strength
• hop performance
• readiness to return to sport

Who It Is Useful For

The ACL-QOL may be useful for:

• exercise professionals
• rehabilitation practitioners
• strength and conditioning coaches
• sport and performance teams
• allied health support teams
• movement assessment professionals
• students learning ACL outcome measures
• professionals using Measurz or MAT for structured progress tracking

It may be relevant for clients with:

• ACL injury
• ACL-deficient knee
• ACL reconstruction
• non-surgical ACL management
• recurrent knee instability concerns
• reduced confidence with pivoting or cutting
• sport participation concerns after ACL injury
• long-term knee quality-of-life impact

The ACL-QOL is most relevant when ACL injury is a key part of the client’s presentation.

When to Use This Outcome Measure

Use the ACL-QOL when you want to understand how an ACL injury affects the client’s quality of life.

It may be useful at:

• initial ACL assessment
• post-injury baseline
• pre-operative review
• post-operative follow-up
• return-to-running review
• return-to-training review
• return-to-sport planning
• long-term monitoring
• discharge or progress review

The ACL-QOL is most useful when repeated over time using the same version and scoring method.

When Not to Use or When to Be Cautious

Use caution when:

• ACL injury is not the main presentation
• the client has general knee pain without ACL involvement
• the client cannot complete the questionnaire independently
• language or literacy affects responses
• the wrong language version is used
• sport items are not relevant
• work items are not relevant
• many items are missing
• the score is being used as a diagnosis
• the score is being used as return-to-sport clearance

The ACL-QOL should not be used to:

• diagnose ACL injury
• confirm ACL rupture
• confirm graft status
• determine graft healing
• identify meniscal or cartilage injury
• clear someone for sport
• replace physical assessment
• replace professional judgement
• replace medical review where needed

Equipment or Resources Required

• ACL-QOL questionnaire
• Version-specific scoring guide
• Measurz recording workflow
• Client-reported symptom notes
• Baseline and retest dates
• Optional related measures, such as:
  • KOOS
  • Lysholm Knee Scoring Scale
  • ACL Return to Sport after Injury scale
  • Tampa Scale for Kinesiophobia
  • Pain Self-Efficacy Questionnaire
  • knee range of motion
  • quadriceps strength
  • hamstring strength
  • hop testing
  • change-of-direction testing
  • sport exposure tracking

Administration Protocol / Practice

Setup

Explain the purpose of the questionnaire before the client completes it.

Example wording:

“This questionnaire helps us understand how your ACL injury is affecting your knee confidence, sport, work, lifestyle and quality of life. It does not diagnose the injury or clear you for sport on its own, but it helps us monitor progress over time.”

Format

The ACL-QOL can be completed:

• on paper
• digitally
• independently
• verbally if assistance is needed
• before a session
• during reassessment
• as part of a Measurz workflow

Client Instructions

Ask the client to:

• answer based on their ACL-related knee problem
• answer all items where possible
• use the response scale provided
• avoid overthinking each item
• ask for clarification if they do not understand wording
• complete the same version at each retest

Completion Method

Record whether the ACL-QOL was completed:

• independently
• digitally
• on paper
• verbally
• with assistance

This supports repeatability and helps interpret change over time.

Assistance Rules

If assistance is needed:

• explain instructions without leading the answer
• avoid telling the client which score to choose
• avoid prompting toward a “better” or “worse” response
• record that assistance was provided
• use the same assistance approach at retest where possible

Missing Item Handling

Do not guess missing responses.

For best practice:

• encourage completion of all items
• record missing items
• record which domain the missing item belongs to
• avoid calculating domain or total scores if scoring guidance does not allow it
• interpret incomplete scores cautiously
• use the same version and scoring rules at retest

Scoring Process

ACL-QOL scoring can vary depending on the version and source used.

Some versions use visual analogue scale-style item scoring and convert results into a percentage score, while some clinical summaries describe a raw total score approach. Because scoring format may differ across versions, always follow the scoring instructions attached to the questionnaire being used.

For Measurz recording, document:

• version used
• scoring method used
• total score
• domain scores if calculated
• score range
• direction of scoring
• missing items
• whether scores are raw, percentage or transformed

General interpretation:

• Higher scores: better ACL-related quality of life
• Lower scores: greater ACL-related quality-of-life impact

Retesting Considerations

Retest at meaningful time points, such as:

• baseline
• after early rehabilitation
• before running progression
• before change-of-direction progression
• before return-to-training exposure
• before return-to-sport decisions
• after a flare-up or instability event
• post-operative milestones
• discharge or long-term follow-up

For consistency, record:

• date
• affected side
• dominant side
• surgical or non-surgical status
• time since injury
• time since surgery, if relevant
• current training exposure
• current running, jumping, cutting or pivoting exposure
• current sport participation
• recent instability episodes
• current pain, swelling or symptoms

Safety Notes

The ACL-QOL is a self-report questionnaire, so it does not create physical testing risk.

However, worsening scores may support further assessment where the client reports:

• increasing instability episodes
• reduced confidence
• worsening sport avoidance
• increasing pain or swelling
• major emotional impact
• reduced function despite objective progress

Scoring and Interpretation

The ACL-QOL is interpreted as an ACL-related quality-of-life measure.

Higher scores generally indicate better ACL-related quality of life.

Lower scores generally indicate greater quality-of-life impact from ACL injury.

What a High Score May Suggest

A higher ACL-QOL score may suggest:

• better perceived knee-related quality of life
• greater confidence with daily activity
• fewer ACL-related concerns
• better sport and recreation confidence
• less lifestyle impact
• less social or emotional burden

What a Low Score May Suggest

A lower ACL-QOL score may suggest:

• greater ACL-related quality-of-life impact
• reduced confidence with the knee
• sport or recreation limitations
• work or lifestyle restrictions
• more worry about symptoms or re-injury
• greater emotional or social impact

Domain Pattern Matters

Look at the domain pattern rather than only the total score.

Examples:

• Physical complaints may improve before sport confidence returns.
• Work concerns may be low while sport concerns remain high.
• Social and emotional concerns may remain even when strength improves.
• Lifestyle impact may change with sport exposure and confidence.

What the Score Does Not Prove

An ACL-QOL score does not prove:

• ACL diagnosis
• graft integrity
• graft healing
• knee stability
• meniscal or cartilage status
• physical readiness
• psychological readiness
• return-to-sport clearance
• whether one intervention caused change

How to Explain the Result Safely

Example wording:

“Your ACL-QOL score suggests your quality of life is improving, but sport and confidence are still affected. This does not tell us whether the ACL or graft is structurally ready for sport, but it helps us track how your knee is affecting the activities that matter to you.”

What the Score May Mean in Different Client Populations

General Fitness Clients

For general fitness clients, ACL-QOL may help show how ACL injury affects:

• gym confidence
• walking and stairs
• work tasks
• lifestyle routines
• fear of instability
• confidence with activity progression

Interpretation cautions:

• sport items may be less relevant
• recent flare-ups may affect responses
• physical capacity should still be assessed

Sport and Performance Clients

For athletes, ACL-QOL can help capture sport-specific quality-of-life impact.

It may help monitor:

• confidence returning to training
• worry about cutting or pivoting
• fear of re-injury
• frustration with restricted participation
• social and emotional impact of being away from sport
• quality-of-life response to increasing sport exposure

A high ACL-QOL score should not be treated as return-to-sport clearance on its own.

Youth and Adolescent Clients

The ACL-QOL was developed mainly in adult populations, but adolescent validation research is available.

A 2021 study evaluated the validity, responsiveness, reliability and readability of the ACL-QOL in an adolescent population, noting that the ACL-QOL had already demonstrated validity, responsiveness and reliability in adult populations.  

Interpretation in youth should consider:

• reading level
• parent or guardian support
• sport exposure
• school demands
• emotional response
• developmental stage

ACL-Deficient Clients

For clients managed without reconstruction, ACL-QOL may help monitor:

• confidence with daily activity
• instability concerns
• sport participation
• lifestyle change
• work or recreation impact

Interpretation should include:

• giving-way episodes
• strength testing
• hop testing where appropriate
• movement confidence
• sport goals
• activity exposure

ACL Reconstruction Clients

For ACL reconstruction clients, ACL-QOL may help monitor perceived quality-of-life recovery after surgery.

Interpretation should consider:

• graft type if relevant
• time since surgery
• rehabilitation stage
• strength symmetry
• hop testing
• sport exposure
• confidence and psychological readiness
• swelling or symptom response
• surgical guidance where relevant

Long-Term ACL Clients

Long-term ACL injury impact may include sport participation, confidence, osteoarthritis concerns and quality of life.

Studies have reported ongoing quality-of-life impairments after ACL reconstruction and ACL deficiency, supporting the value of monitoring QoL beyond early physical recovery.  

Meaningful Change, MCID, MDC and Responsiveness

Meaningful change helps determine whether an ACL-QOL score change is likely to matter.

Key terms:

• MCID / MIC: the smallest change that may be meaningful to clients or professionals, depending on method used
• MDC: the amount of change likely needed to exceed measurement error
• SEM: estimated measurement error around a score
• Responsiveness: ability of the questionnaire to detect change over time

ACL-QOL Meaningful Change Evidence

Meaningful change values for ACL-QOL appear less widely standardised than some broader knee measures.

Research has examined MCID after ACL reconstruction for multiple PROMs, but many studies focus on IKDC, KOOS, Lysholm and ACL-RSI rather than ACL-QOL specifically. One ACL reconstruction MCID study highlights the growing interest in MCID values after ACL reconstruction but does not make ACL-QOL the only focus.  

A 2015 study reported further validation of the ACL-QOL by demonstrating responsiveness to change after ACL reconstruction.  

Practical Interpretation

When interpreting ACL-QOL change:

• compare total and domain scores with baseline
• use the same version and scoring method at retest
• consider whether quality-of-life change aligns with activity exposure
• compare with strength, hop and movement findings
• check pain, swelling and instability history
• consider confidence and psychological readiness separately
• avoid over-interpreting very small changes

When Values Are Uncertain

Reported meaningful change values may vary by:

• ACL-deficient versus ACL-reconstructed knee
• surgical versus non-surgical management
• time since injury
• time since surgery
• baseline score
• sport level
• scoring method
• follow-up timeframe
• language version

When no matching MCID, MDC or SEM exists, interpretation should rely more heavily on:

• baseline comparison
• repeated measurement
• domain pattern
• client-reported change
• activity exposure
• instability event history
• related physical assessment findings
• professional judgement

Normative Data, Reference Values or Comparative Data

Broad general-population ACL-QOL norms are limited because the ACL-QOL is an ACL-specific questionnaire.

Evidence level: Level 3 — practical comparison guidance is recommended because broad normative values are not generally applicable.

Use:

• baseline comparison
• retest comparison
• domain-level patterns
• sport exposure
• confidence notes
• pain, swelling and instability response
• related physical assessment findings

Practical guidance:

• Higher scores generally suggest better ACL-related quality of life.
• Lower scores suggest greater ACL-related quality-of-life impact.
• Baseline and repeated measures are usually more useful than one isolated score.
• Compare scores only when the same version and scoring method are used.
• Avoid using ACL-QOL as a return-to-sport threshold.
• Pair ACL-QOL with knee function, strength, hop and sport-readiness measures.

Comparison should consider:

• age
• sex
• sport level
• sport type
• surgical or non-surgical status
• time since injury
• time since surgery
• previous ACL injury
• meniscal or cartilage involvement
• current activity exposure

Reliability and Validity

The ACL-QOL has post-2000 evidence supporting its use in ACL-related populations.

A 2016 study in 579 ACL-deficient clients undergoing ACL reconstruction reported that the ACL-QOL had validity and responsiveness and followed clients at 6, 12 and 24 months after surgery.  

A 2022 Dutch translation and validation study stated that the ACL-QOL is a valid and reliable injury-specific instrument to assess the impact of ACL rupture on daily life.  

A 2024 review of PROMs used in ACL injury reported that ACL-QOL was one of the ACL-related measures evaluated for internal consistency, alongside Lysholm, IKDC and ACL-RSI.  

Reliability and validity are stronger when:

• the correct ACL-QOL version is used
• the correct language version is used
• all items are completed
• the same scoring method is repeated
• domain scores are interpreted in context
• retesting occurs at meaningful time points
• results are interpreted alongside physical and sport-specific assessment

Interpret cautiously when:

• many items are missing
• the client is outside the intended population
• the client has not returned to relevant activities
• sport exposure has changed substantially
• the score is used as a stand-alone diagnosis or clearance decision
• the language version has limited validation evidence

Common Errors and Limitations

Common errors include:

• treating ACL-QOL as an ACL diagnosis
• using ACL-QOL as return-to-sport clearance
• not recording the version used
• not recording scoring method
• mixing raw and percentage scores across retests
• not recording surgical or non-surgical status
• not recording time since injury or surgery
• ignoring sport exposure
• ignoring missing items
• failing to pair it with physical testing

Limitations include:

• self-report can be influenced by recent symptoms, sport exposure and confidence
• scores do not identify structural knee status
• broad normative values are limited
• meaningful change values are not always clearly established for every population
• quality of life may be affected by non-knee factors
• high scores do not guarantee readiness for pivoting, contact or competition
• it should be paired with history, physical testing, sport exposure and client goals

Practical Applications

The ACL-QOL may help professionals:

• document baseline ACL-related quality-of-life impact
• monitor change after ACL injury
• monitor progress after ACL reconstruction
• identify whether sport, work, lifestyle or emotional domains are most affected
• support return-to-training discussions
• support long-term ACL progress tracking
• improve client education
• communicate progress with coaches or support teams
• strengthen Measurz reports

For athletes, ACL-QOL can highlight ongoing quality-of-life impact even when strength and hop scores are improving.

For non-surgical ACL clients, it can support monitoring of confidence, instability impact and lifestyle adaptation.

For post-operative clients, it can help track whether daily life and sport-related quality of life are improving over time.

For Measurz users, ACL-QOL is most useful when combined with:

• KOOS
• Lysholm Knee Scoring Scale
• ACL Return to Sport after Injury scale
• Tampa Scale for Kinesiophobia
• quadriceps strength
• hamstring strength
• hop testing
• change-of-direction testing
• movement quality
• sport exposure tracking
• pain and swelling records

How to Record This in Measurz

Record:

• outcome measure name: ACL Quality of Life / ACL-QOL / QOL-ACL
• version used
• date completed
• completion method: paper, digital, interview or assisted
• language/version used
• affected side: left, right or bilateral
• dominant side
• injury status: ACL-deficient, reconstructed or other
• surgical or non-surgical management
• time since injury
• time since surgery, if relevant
• total score
• domain scores, if calculated:
  • Symptoms and Physical Complaints
  • Work-Related Concerns
  • Recreational Activities and Sport
  • Lifestyle
  • Social and Emotional Concerns
• score range used
• direction of scoring: higher score indicates better ACL-related quality of life
• scoring method: raw, percentage, transformed or other
• missing items, if any
• assistance provided, if any
• recent instability episodes
• current pain score, if relevant
• current swelling or symptom notes
• current training or sport exposure
• current running, jumping, cutting or pivoting exposure
• current confidence level
• key quality-of-life limitations
• baseline comparison
• MCID/MDC/SEM comparison where supported
• related physical assessment findings
• interpretation notes
• retest date
• referral or further assessment notes where appropriate

Record whether the main limitation appears to be:

• symptoms and physical complaints
• work-related concerns
• recreational activity or sport limitation
• lifestyle limitation
• social or emotional quality-of-life impact
• confidence limitation
• mixed ACL-related limitation
• unclear due to incomplete responses

This improves:

• repeatability
• communication
• client education
• assessment reasoning
• monitoring over time
• team consistency
• reporting quality

Related Outcome Measures / Internal Links

• Knee Injury and Osteoarthritis Outcome Score / KOOS
• Lysholm Knee Scoring Scale
• Lower Extremity Functional Scale / LEFS
• Tampa Scale for Kinesiophobia / TSK
• Pain Self-Efficacy Questionnaire / PSEQ
• Fear-Avoidance Beliefs Questionnaire / FABQ
• Örebro Musculoskeletal Pain Screening Questionnaire
• Foot and Ankle Outcome Score / FAOS
• Hip Disability and Osteoarthritis Outcome Score / HOOS

FAQs

What does the ACL-QOL measure?

The ACL-QOL measures ACL-related quality of life, including symptoms, work, sport and recreation, lifestyle, and social or emotional impact.

Is ACL-QOL the same as KOOS?

No. ACL-QOL is ACL-specific and focuses on quality of life after ACL injury. KOOS is a broader knee outcome measure covering pain, symptoms, daily function, sport and quality of life.

How is ACL-QOL scored?

Scoring depends on the version used. Record the version, score range, scoring method and direction every time. Higher scores generally indicate better ACL-related quality of life.

Does ACL-QOL diagnose ACL injury?

No. ACL-QOL measures the client’s reported quality-of-life impact. It does not diagnose ACL injury or confirm graft status.

Can ACL-QOL be used after ACL reconstruction?

Yes. ACL-QOL has been studied in ACL reconstruction populations and can support post-operative progress tracking.  

Can ACL-QOL be used in adolescents?

Yes, adolescent validation research exists, but interpretation should consider reading level, sport context, school demands and developmental stage.  

What is a meaningful change in ACL-QOL?

Meaningful change values are less standardised than some knee PROMs and should be matched to the population, version and context. When unavailable, interpret change using baseline comparison, domain pattern, activity exposure and related physical findings.

Can ACL-QOL clear someone for return to sport?

No. ACL-QOL can support return-to-sport reasoning, but it should be combined with strength testing, hop testing, movement quality, sport exposure, confidence, symptoms and professional judgement.

Key Takeaways

• ACL-QOL is an ACL-specific patient-reported outcome measure.
• It assesses ACL-related quality of life across symptoms, work, sport, lifestyle, and social or emotional domains.
• Higher scores generally indicate better ACL-related quality of life.
• Scoring method and version must be recorded clearly.
• ACL-QOL does not diagnose ACL injury, confirm graft status or clear someone for sport.
• Evidence supports validity, reliability and responsiveness in ACL populations.
• Broad normative values are limited, so baseline and retest comparison are usually most useful.
• Measurz should record version, scoring method, total score, domain scores, side, surgical status, time since injury or surgery, sport exposure, confidence and related physical findings.

References

Friel, N. A., Chu, C. R., et al. (2016). Validity, reliability, and responsiveness of the Anterior Cruciate Ligament Quality of Life questionnaire in a longitudinal study of anterior cruciate ligament reconstructive surgery. Journal of Orthopaedic & Sports Physical Therapy / related ACL-QOL validation literature. PMID: 26780255.

Hoogeslag, R. A. G., et al. (2022). Translation, validity, and reliability of the Dutch Anterior Cruciate Ligament–Quality of Life questionnaire. Orthopaedic Journal of Sports Medicine, 10(9). https://doi.org/10.1177/23259671221118977

Mapi Research Trust. (2026). Anterior Cruciate Ligament-Quality of Life Questionnaire. ePROVIDE. https://eprovide.mapi-trust.org/instruments/anterior-cruciate-ligament-quality-of-life-questionnaire

McPherson, A. L., et al. (2024). Usefulness of current patient-reported outcome scales for ACL injury. Orthopaedic Journal of Sports Medicine. https://doi.org/10.1177/23259671231218964

Prodromidis, A. D., Thivaios, G. C., Mourikis, A., Erginousakis, I. D., Nikolaou, V. S., Vlamis, J., & Chronopoulos, E. (2024). Patient-reported outcome measures used on patients with anterior cruciate ligament injury. Cureus, 16(7), e64546. https://doi.org/10.7759/cureus.64546

Shapiro, L. M., et al. (2021). Validity, responsiveness, and reliability of the ACL-QOL in an adolescent population. Journal of Pediatric Orthopaedics, 41(10), e917–e922. https://doi.org/10.1097/BPO.0000000000001964

Webster, K. E., & Feller, J. A. (2015). Quality of life in anterior cruciate ligament-deficient individuals: A systematic review and meta-analysis. British Journal of Sports Medicine, 49(16), 1033–1041. https://doi.org/10.1136/bjsports-2015-094864