Lysholm Knee Scoring Scale

Abstract

The Lysholm Knee Scoring Scale (alternatively designated as the Lysholm Knee Scale or Lysholm Score) is an eight-item condition-specific questionnaire designed to assess subjective symptoms and functional limitations in patients suffering from knee disorders, most notably anterior cruciate ligament (ACL) injuries, meniscal tears, and chondral pathology. Originally formulated by Jack Lysholm and Jan Gillquist in 1982 at Linköping University, Sweden, and subsequently modified by Tegner and Lysholm in 1985, the instrument quantifies knee instability and symptom-related disability across both impairment and functional limitation domains. The instrument is comprised of eight categorically scored items: limp, support (need for walking aids), locking/catching sensations, joint instability (“giving way”), pain, swelling, stair climbing, and squatting. Unlike generic health-related quality of life inventories, the Lysholm Knee Scoring Scale employs an unequally weighted clinimetric scoring architecture reflecting clinical diagnostic priorities, wherein pain and instability together account for 50 of the maximum 100 points.

Scores range from 0 to 100, where higher scores signify lower levels of knee instability and superior functional performance. Conventional score categorizations delineate clinical outcomes into Poor (< 65), Fair (65–83), Good (84–94), and Excellent (95–100). Extensive psychometric validation studies across international cohorts demonstrate satisfactory to strong test-retest reliability (intraclass correlation coefficients [ICC] ranging from 0.88 to 0.95), acceptable internal consistency (Cronbach’s alpha ranging from 0.65 to 0.82 across varied pathology sub-populations), high responsiveness to clinical and surgical interventions (standardized response mean [SRM] frequently exceeding 0.90 to 1.30), and robust convergent validity against the International Knee Documentation Committee (IKDC) Subjective Knee Form and the Knee Injury and Osteoarthritis Outcome Score (KOOS). The scale is frequently paired with the Tegner Activity Level Scale to distinguish post-injury symptom subsidence from spontaneous activity reduction.

Keywords

Lysholm Knee Scoring Scale, knee instability, anterior cruciate ligament reconstruction, meniscal pathology, patient-reported outcome measures, clinimetrics, joint laxity, orthopedic psychometrics, knee function, Tegner Activity Level Scale, subjective knee score, musculoskeletal assessment

Authors

The Lysholm Knee Scoring Scale was conceptualized, developed, and clinically validated by Swedish orthopedic surgeons and clinical researchers specializing in sports medicine and reconstructive knee arthrometry:

• Jack Lysholm, MD, PhD — Department of Orthopaedic Surgery, University Hospital, Linköping, Sweden. Dr. Lysholm published the baseline iteration of the scale in 1982 during his investigations into reconstructive techniques for knee ligament instability.
• Jan Gillquist, MD, PhD — Department of Orthopaedic Surgery, University Hospital, Linköping, Sweden. A pioneer in modern knee arthroscopy and ligament biomechanics who co-developed the initial instrument.
• Yelverton Tegner, MD, PhD — Department of Orthopaedics, University Hospital, Linköping, Sweden. Dr. Tegner collaborated with Jack Lysholm in 1985 to refine the scale’s weighting and introduce the complementary Tegner Activity Level Scale, differentiating symptom improvement from athletic desensitization.
• Dutch Adaptation: Neeb, T. B. (1993), who translated, cross-culturally adapted, and evaluated the instrument for clinical physical therapy and orthopedic populations in the Netherlands.

Purpose

The principal purpose of the Lysholm Knee Scoring Scale is to provide orthopedic surgeons, physical therapists, and sports medicine researchers with a concise, clinically sensitive measurement of symptomatic knee instability and subjective functional capacity. The scale emerged during an era when orthopedic evaluation was dominated almost exclusively by passive objective physical examination findings—such as the Lachman test, anterior drawer test, and pivot-shift maneuver—or static stress radiography. While mechanical joint laxity provides critical diagnostic data regarding the anatomical integrity of ligamentous constraints, physical signs correlate poorly with a patient’s subjective experience of joint instability, physical capability, and functional impairment in activities of daily living and sports.

The Lysholm Knee Scoring Scale bridges this operational gap by functioning as a disease- and injury-specific patient-reported outcome measure (PROM) that can be administered independently by the patient or completed jointly by the patient and their treating clinician or physical therapist. The scale serves several primary purposes:

• Longitudinal Tracking of Post-Operative Outcomes: It is widely employed in evaluating the efficacy of ACL reconstruction, revision ligament surgery, partial meniscectomy, meniscal repair, autologous chondrocyte implantation, and high tibial osteotomy.
• Rehabilitation Monitoring: Physical therapists utilize the scale to evaluate functional milestones during post-injury or post-surgical physical therapy, helping to guide decisions regarding progression into plyometrics, cutting drills, and return-to-sport protocols.
• Clinical Trial Endpoint Measurement: Serving as a primary or secondary endpoint in hundreds of randomized controlled trials and cohort studies comparing surgical techniques, graft choices (e.g., bone-patellar tendon-bone versus quadrupled semitendinosus-gracilis autografts), and biological adjuncts (such as platelet-rich plasma or stem cell therapies).
• Identification of Functional vs. Structural Discrepancies: By measuring symptoms such as “giving way” during functional tasks alongside mechanical sensations like catching and locking, the scale highlights compensatory neuromuscular deficits that may persist even after anatomical reconstruction has established mechanical stability.

Psychological Construct

The underlying construct evaluated by the Lysholm Knee Scoring Scale is symptomatic knee joint functional impairment, specifically focusing on subjective instability, mechanical disruption, nociception, and mobility restrictions arising from internal derangement of the knee joint. This construct encompasses both biological impairments and behavioral adaptations to physical limitations, manifesting across eight primary dimensions:

1. Gait Disturbance (Limp)

This dimension assesses alterations in normal human gait mechanics stemming from antalgic avoidance, quadriceps inhibition, or structural instability. Gait asymmetry represents a primary manifestation of musculoskeletal compensation. Chronic limping can generate abnormal kinematic chains across the ankle, hip, and lumbar spine, serving as a functional indicator of uncompensated joint pathology.

2. Assistive Support Requirement

This item captures the patient’s structural dependence on external mobility aids, such as crutches or canes, as well as severe functional decrements preventing weight-bearing altogether. The construct encompasses both mechanical necessity (inability to bear axial loads due to tissue failure or acute trauma) and kinesiophobia, where external support provides compensatory psychological reassurance.

3. Mechanical Symptoms (Locking and Catching)

Joint locking and catching reflect structural mechanical disturbances, typically produced by displaced bucket-handle meniscal tears, unstable chondral flaps, or intra-articular loose bodies that physically impede the normal roll-and-glide arthrokinematics of the femorotibial joint. This dimension captures sensations ranging from subtle, transient catching to true mechanical joint blockage requiring manual manipulation or surgical release.

4. Dynamic Instability (Giving Way)

Instability is the core construct of the Lysholm scale, carrying the largest individual score weight (25 points). Subjective “giving way” represents the sudden, unexpected subluxation of the tibia relative to the femur under weight-bearing conditions. This reflects not merely static ligamentous insufficiency, but a failure of the complex sensorimotor, proprioceptive, and neuromuscular envelope to dynamically stabilize the knee under varying biomechanical demands—from severe athletic exertion down to routine ambulation and individual walking steps.

5. Nociceptive Pain Burden

Weighted equally with instability at 25 points, the pain dimension evaluates the threshold at which physical exertion elicits pain, ranging from complete absence of discomfort, to exercise-induced pain, to marked pain during limited walking distances (< 2 km), culminating in constant, unremitting discomfort. This reflects both mechanical nociception and inflammatory joint reactivity.

6. Joint Effusion (Swelling)

Joint effusion reflects the intra-articular inflammatory environment, synovitis, or capsular irritation produced by mechanical loading of an injured or unstable joint. The construct captures the loading threshold required to precipitate swelling, separating high-velocity sporting loads from basic activities of daily living and persistent resting effusion.

7. Axial Loading and Deceleration (Stair Climbing)

Stair negotiation imposes demanding biomechanical loads on the extensor mechanism, requiring eccentric quadriceps control during descent and concentric force generation during ascent, while generating substantial shear and compressive forces across the patellofemoral and tibiofemoral joints. Impairment reflects both quadriceps muscle inhibition and apprehension during combined flexion and axial loading.

8. Deep Flexion Tolerance (Squatting)

Deep knee flexion dramatically increases compressive loads on the posterior horns of the medial and lateral menisci and amplifies retropatellar contact stress. Inability to squat beyond 90 degrees captures functional restrictions driven by mechanical impingement, posterior horn meniscal stress, or patellofemoral degeneration.

Theoretical Framework

The development and interpretation of the Lysholm Knee Scoring Scale align with the conceptual framework of the World Health Organization’s International Classification of Functioning, Disability and Health (ICF), as well as the transition from classical biomechanical reductionism to contemporary biopsychosocial and clinimetric models in sports medicine.

The ICF Conceptual Integration

Within the ICF taxonomy, human functioning is conceptualized across three interconnected levels: Body Functions and Structures (impairment), Activities (limitations), and Participation (restrictions):

• Body Functions and Structures (Impairment Level): Dimensions such as pain (b280), swelling/effusion (b715), and joint stability (b7150) capture fundamental pathophysiological derangements occurring within intra-articular knee tissues.
• Activity Limitations: Items evaluating stair climbing (d4551), squatting (d4101), walking with assistive devices (d465), and limping (d4500) map directly onto specific functional activities that require coordinated neuromusculoskeletal activation.
• Interaction with Participation Restrictions: While the Lysholm scale focuses primarily on impairment and activity limitations, its instability and pain items identify functional boundaries that dictate whether an individual can participate in work or recreational pursuits. However, to fully capture participation restrictions, Tegner and Lysholm (1985) introduced the Tegner Activity Level Scale, recognizing that high-demand athletes may report high Lysholm scores simply because they have chosen to avoid high-demand activities altogether.

Clinimetric vs. Psychometric Architecture

From a theoretical measurement standpoint, the Lysholm Knee Scoring Scale is rooted in clinimetrics rather than classical reflective psychometrics. In a classical reflective psychometric model (such as those governing latent trait anxiety or depression scales), all items are considered interchangeable manifestations of a single underlying latent variable, and equal or standardized factor-derived item weights are typical. In contrast, clinimetric indexes (pioneered by Alvan Feinstein) construct scores through deliberate, clinically meaningful weightings assigned to heterogeneous biological and behavioral symptoms.

Lysholm and Gillquist intentionally weighted dynamic instability (25 points) and pain (25 points) to constitute 50% of the aggregate score, reflecting the clinical reality that for a patient with an ACL deficiency or meniscal tear, pain-free stability is the paramount determinant of functional joint health. Conversely, limp (5 points) and support (5 points) receive smaller weights because they are often secondary manifestations or transient post-injury behaviors.

Validity

The Lysholm Knee Scoring Scale has undergone extensive empirical evaluation to establish its construct, criterion, convergent, discriminant, and content validity across diverse clinical and cultural settings.

Construct and Convergent Validity

Numerous cross-sectional and prospective cohort studies have evaluated the convergent validity of the Lysholm scale against modern knee-specific and health-related quality of life outcome measures:

• Correlation with IKDC: In validation studies by Briggs et al. (2009) and Irrgang et al. (2001), the Lysholm score demonstrated strong, positive correlations with the International Knee Documentation Committee (IKDC) Subjective Knee Form, with Pearson and Spearman correlation coefficients typically ranging between r = 0.78 and r = 0.86 (p < 0.001). This confirms that both instruments capture overlapping domains of knee dysfunction and subjective symptom severity.
• Correlation with KOOS: Comparative evaluations against the Knee Injury and Osteoarthritis Outcome Score (KOOS) subscales demonstrate strong correlations between Lysholm scores and the KOOS Pain (r = 0.72 to 0.81), Symptoms (r = 0.64 to 0.75), and Sport/Recreation (r = 0.68 to 0.79) subscales. Conversely, correlations with the KOOS Quality of Life subscale are moderate (r = 0.52 to 0.65), reflecting the Lysholm scale’s targeted focus on direct physical symptoms rather than broader psychosocial adaptation.
• Correlation with SF-36: When evaluated against the Short Form 36 (SF-36) Health Survey, the Lysholm score displays high convergent validity with the Physical Functioning (PF) domain (r = 0.60 to 0.74) and Physical Component Summary (PCS), but weak or negligible correlation with the Mental Health (MH) and Mental Component Summary (MCS) domains (r = 0.15 to 0.28). This divergence provides evidence of discriminant validity, showing that the Lysholm scale specifically measures musculoskeletal physical impairment rather than generalized psychological distress.

Known-Groups Validity

The scale effectively discriminates between known patient subgroups with varying degrees of pathology. Cohort comparisons demonstrate statistically significant differences in Lysholm scores between uninjured athletic controls (mean scores: 96–100), patients with chronic untreated ACL deficiency (mean scores: 55–72), and patients successfully rehabilitated following anatomical reconstruction (mean scores: 85–94; p < 0.001). Furthermore, the scale reliably differentiates between patients classified as “copers” (individuals who regain functional stability despite an ACL tear) and “non-copers” who experience frequent episodes of joint subluxation during daily tasks.

Responsiveness and Longitudinal Validity

Responsiveness parameters confirm that the scale is sensitive to clinically meaningful changes following operative and physical therapy interventions. Standardized Response Means (SRM) calculated 6 to 12 months after ACL reconstruction or meniscal surgery consistently range from 0.95 to 1.45, indicating a large effect size. The Minimal Clinically Important Difference (MCID) has been estimated across several studies to range between 8.9 and 10.1 points, establishing an evidence-based threshold for determining meaningful clinical recovery.

Reliability

The reliability of the Lysholm Knee Scoring Scale has been documented across numerous studies, evaluating internal consistency, test-retest stability, and measurement precision.

Test-Retest Reliability

Test-retest reliability reflects the degree to which an instrument yields stable, reproducible scores in medically stable patients across distinct assessment intervals (typically ranging from 48 hours to 2 weeks):

• Intraclass Correlation Coefficients (ICC): In the landmark psychometric re-evaluation conducted by Briggs et al. (2009) involving patients with diverse knee conditions, the overall test-retest reliability was observed at an ICC of 0.91 (95% CI: 0.86–0.94).
• Cross-Cultural Reliability: International adaptations have yielded comparable test-retest reliability statistics: the German adaptation demonstrated an ICC of 0.93; the Italian version reported an ICC of 0.95; the Persian version yielded an ICC of 0.91; and the Dutch version (Neeb et al.) documented an ICC of 0.89. These high coefficients indicate that the instrument is resilient to random temporal variation and minor scoring discrepancies.

Internal Consistency

Evaluations of internal consistency using Cronbach’s alpha have reported values generally falling between α = 0.65 and α = 0.82. Psychometricians note that because the Lysholm scale is a clinimetric index composed of heterogeneous symptoms (e.g., a patient with an isolated meniscal bucket-handle tear may have severe locking and pain but no true ligamentous instability), an exceptionally high Cronbach’s alpha (> 0.90) would not be expected. In this context, an alpha value around 0.70–0.80 indicates adequate item coherence without redundancy.

Standard Error of Measurement and Detectable Change

Psychometric investigations indicate a Standard Error of Measurement (SEM) ranging from 3.2 to 4.5 points on the 100-point scale. Consequently, the Minimal Detectable Change at the 95% confidence level (MDC₉₅)—which defines the true threshold beyond which a score variation reflects genuine clinical change rather than measurement error—is calculated at approximately 8.9 to 11.5 points. This closely aligns with the established MCID, confirming its utility for individual patient decision-making.

Factor Analysis

The structural dimensionality of the Lysholm Knee Scoring Scale has been examined using both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA), along with modern item response models such as Rasch measurement theory.

Dimensionality and Exploratory Models

While the Lysholm scale is traditionally administered as a unidimensional summary index ranging from 0 to 100, factor analytic studies frequently reveal a multidimensional latent structure:

• Two-Factor Model: Most EFA studies across orthopedic populations report a two-factor solution accounting for 54% to 66% of total variance:
• Factor 1: Dynamic Loading and Functional Activities: Encompassing stair climbing, squatting, and limp, which demonstrate high factor loadings (> 0.65). These items represent mechanical capacity under axial load and eccentric quadriceps demand.
• Factor 2: Joint Pathology and Instability Symptoms: Encompassing instability, pain, swelling, and locking (> 0.60 loadings), capturing intrinsic intra-articular pathology and joint failure.
• Item Loadings and Anomalies: Support (use of a cane or crutch) frequently exhibits low commonality or split factor loadings in active, non-acute populations, largely because high-functioning athletic patients rarely utilize walking aids outside the immediate post-injury or perioperative period.

Confirmatory Factor Analysis and Rasch Diagnostics

CFA assessments examining the unidimensional hypothesis typically report acceptable to marginal model fit indices (e.g., Comparative Fit Index [CFI] = 0.90–0.94, Root Mean Square Error of Approximation [RMSEA] = 0.06–0.08). Rasch analysis reveals that the Lysholm scale functions as a clinimetric composite rather than a single linear metric. The distinct item weights (e.g., 25 points for instability vs. 5 points for squatting) reflect empirical clinician priorities rather than mathematical intervals. Consequently, researchers recommend utilizing the total score as an operational composite index of knee disability rather than assuming interval-level properties across latent trait continuums.

Instrument / Measurement Tool

The Lysholm Knee Scoring Scale is an eight-item evaluation instrument that can be administered in clinical settings, physical therapy facilities, or completed independently as a patient-reported outcome form. The administrative parameters are detailed below:

• Instrument Type: Condition-specific patient-reported outcome measure (PROM) / Clinician-guided rating scale.
• Target Population: Adolescents, adults, and older individuals presenting with knee ligament tears, meniscal pathology, chondral defects, patellofemoral disorders, or post-operative reconstructive interventions.
• Administration Format: Self-administered paper-and-pencil or digital questionnaire, often reviewed with the physical therapist or orthopedic surgeon to clarify mechanical terms (such as true joint “locking” versus subjective stiffness).
• Completion Time: Approximately 3 to 7 minutes.
• Item Count: 8 categorically scored items.
• Response Scale: Categorical weighted item responses (total score ranges from 0 to 100 points).
• Scoring Architecture: Cumulative summation of points across the eight items. The point distributions per item are:
• Limp: 0, 3, or 5 points
• Support: 0, 2, or 5 points
• Locking: 0, 2, 6, 10, or 15 points
• Instability: 0, 5, 10, 15, 20, or 25 points
• Pain: 0, 5, 10, 15, 20, or 25 points
• Swelling: 0, 2, 6, or 10 points
• Stair climbing: 0, 2, 6, or 10 points
• Squatting: 0, 2, 4, or 5 points
• Score Interpretation Categories:
• 95 – 100 Points: Excellent knee function; minimal or absent symptomatic impairment.
• 84 – 94 Points: Good knee function; mild impairment during strenuous exertion.
• 65 – 83 Points: Fair knee function; moderate impairment during daily tasks or mild exertion.
• < 65 Points: Poor knee function; severe symptomatic disability, marked instability, or persistent pain.

Permissions & Fee and Test Year

The initial version of the Lysholm Knee Scoring Scale was published in 1982 by Jack Lysholm and Jan Gillquist in The American Journal of Sports Medicine, followed by its modified version in 1985 co-authored with Yelverton Tegner. The Dutch cross-cultural adaptation was published in 1993 by T. B. Neeb. The instrument resides in the public domain for clinical and academic research applications. No licensing fees or royalty payments are required for standard clinical practice or academic study, provided appropriate formal citation is given to the original publications. Commercial entities incorporating the scale into proprietary digital health platforms typically obtain verification or adhere to open academic fair-use attribution conventions.

References

• Briggs, K. K., Lysholm, J., Tegner, Y., Rodkey, W. G., & Steadman, J. R. (2009). The reliability, validity, and responsiveness of the Lysholm score and Tegner activity scale for patients with ACL injuries of the knee. The American Journal of Sports Medicine, 37(5), 890–897. https://doi.org/10.1177/0363546508330143
• Briggs, K. K., Steadman, J. R., Hay, C. J., & Hines, S. L. (2006). Lysholm score and Tegner activity level in individuals with normal knees. The American Journal of Sports Medicine, 34(6), 898–901. https://doi.org/10.1177/0363546505284183
• Irrgang, J. J., Anderson, A. F., Boland, A. L., Harner, C. D., Kurosaka, M., Neyret, P., Richmond, J. C., & Shelborne, K. D. (2001). Development and validation of the International Knee Documentation Committee Subjective Knee Form. The American Journal of Sports Medicine, 29(5), 600–613. https://doi.org/10.1177/03635465010290051301
• Lysholm, J., & Gillquist, J. (1982). Evaluation of knee ligament surgery results with special emphasis on use of a scoring scale. The American Journal of Sports Medicine, 10(3), 150–154. https://doi.org/10.1177/036354658201000306
• Neeb, T. B. (1993). De Lysholm Knee Scoring Scale: Nederlandse versie en betrouwbaarheidsonderzoek. Nederlands Paramedisch Instituut (NPi), Amersfoort.
• Roos, E. M., Roos, H. P., Lohmander, L. S., Ekdahl, C., & Beynnon, B. D. (1998). Knee Injury and Osteoarthritis Outcome Score (KOOS)—development of a self-administered outcome measure. Journal of Orthopaedic & Sports Physical Therapy, 28(2), 88–96. https://doi.org/10.2519/jospt.1998.28.2.88
• Tegner, Y., & Lysholm, J. (1985). Rating systems in the evaluation of knee ligament injuries. Clinical Orthopaedics and Related Research, 198, 43–49. https://doi.org/10.1097/00003086-198509000-00007
• Wang, D., Jones, M. H., Khair, M. M., & Miniaci, A. (2010). Patient-reported outcome measures for the knee. The Journal of Knee Surgery, 23(3), 137–151. https://doi.org/10.1055/s-0031-1275390

Items of the Scale