Tegner Score

1. Abstract

The Tegner Score (also widely recognized in orthopedic and sports psychology literature as the Tegner Activity Scale) is a graduated, single-item patient-reported outcome measure (PROM) designed to assess the functional level of physical activity, occupational exertion, and sports participation. Developed in 1985 by Swedish orthopedic surgeon Yelverton Tegner and colleagues, the scale was engineered to complement joint-specific functional disability scores, most notably the Lysholm Knee Scoring Scale, by providing an objective, standardized metric of knee joint loading and functional behavioral performance. The instrument spans eleven ordinal levels from 0 to 10, where Level 0 designates total disability or sick leave attributable to knee disorders, and Level 10 represents competitive participation in national or international elite-level contact and pivoting sports (e.g., soccer, football, rugby). Unlike generalized health-related quality of life inventories, the Tegner Score isolates the physical performance threshold of the lower extremity, capturing the qualitative gradients between competitive sports, recreational athletics, heavy occupational labor, moderate domestic exertion, and sedentary living.

Psychometrically, the Tegner Score demonstrates robust measurement attributes across broad orthopedic populations, particularly patients undergoing anterior cruciate ligament (ACL) reconstruction, meniscal repair, cartilage restoration procedures, and surgical management of patellofemoral instability. Extensive literature confirms high test-retest reliability, with intraclass correlation coefficients (ICC) consistently ranging between 0.82 and 0.97 across observational intervals ranging from several days to several months. Construct and convergent validity are demonstrated via moderate-to-strong correlations with the International Knee Documentation Committee (IKDC) Subjective Knee Form, the Marx Activity Rating Scale, and objective functional tests such as single-leg hop metrics. While conventional internal consistency metrics like Cronbach’s alpha and classic exploratory or confirmatory factor analyses are mathematically inapplicable due to the instrument’s single-item graduated structure, modern validation studies applying non-parametric item response theory (IRT), Guttman scalogram analysis, and clinimetric construct mapping substantiate its unidimensional hierarchy of mechanical knee stress and physical demand.

2. Keywords

Tegner Score, Tegner Activity Scale, patient-reported outcome measures, physical activity level, anterior cruciate ligament, knee kinematics, sports psychology, psychometrics, test-retest reliability, functional recovery, orthopedic evaluation, athletic return-to-play

3. Authors

The primary architect of the Tegner Score is Yelverton Tegner, MD, PhD, Professor Emeritus in Physiotherapy and Sports Medicine at the Department of Health Sciences, Luleå University of Technology, Luleå, Sweden. Professor Tegner is an internationally acknowledged pioneer in sports medicine, orthopedic rehabilitation, and traumatology. The original validation and design studies were co-authored with Jack Lysholm, MD, PhD, of the Department of Orthopedic Surgery at the University Hospital of Linköping, Linköping, Sweden. Both researchers sought to standardize the clinical evaluation of knee ligament injuries and distinguish joint symptom severity from behavioral activity adaptations.

4. Purpose

The clinical and behavioral rationale underpinning the development of the Tegner Score addresses a fundamental limitation in musculoskeletal assessment: the confounding interaction between functional joint symptoms and self-selected activity limitation. In standard clinical evaluations conducted prior to the mid-1980s, patients presenting with profound ligamentous laxity or chondral pathology frequently reported minimal pain or instability simply because they had ceased participating in demanding physical tasks or high-velocity athletic pursuits. Conversely, elite athletes pursuing peak competitive demands routinely reported functional limitations despite possessing minor physiological joint deficits. By decoupling symptom severity (measured through instruments such as the Lysholm Score) from the actual physical load placed on the musculoskeletal system, the Tegner Score provides clinicians, sports psychologists, and clinical researchers with an accurate baseline against which symptom resolution, functional recovery, and therapeutic efficacy can be evaluated.

From an applied perspective, the Tegner Score serves several crucial functions in sports medicine, orthopedic rehabilitation, and research environments:

• Baseline Athletic Profile Quantification: It systematically captures pre-injury physical performance levels retrospectively, establishing an individualized reference point for rehabilitation benchmarks and determining the true degree of athletic restitution post-intervention.
• Longitudinal Activity Monitoring: It tracks the gradual escalation of biomechanical load across distinct phases of physical therapy, distinguishing between non-weight-bearing sedentary recovery (Levels 0–1), ambulatory reconditioning (Levels 2–4), recreational sporting activities (Levels 5–7), and pivot-intensive competitive performance (Levels 8–10).
• Stratification Variable in Clinical Trials: It acts as an indispensable covariate in prospective clinical trials, allowing researchers to adjust for differing mechanical exposure across intervention arms when evaluating surgical failure rates, secondary graft ruptures, or long-term osteoarthritic progression.
• Psychological and Behavioral Concordance Assessment: In tandem with measures of fear of movement (e.g., Tampa Scale for Kinesiophobia) and athletic self-efficacy, discrepancies between physiological joint stability and the Tegner Score identify psychobehavioral inhibition, kinesiophobia, or psychological readiness deficits that impede full return to sport.

5. Psychological Construct

The construct measured by the Tegner Score is multidimensional in operational practice, yet strictly unidimensional in functional hierarchy: it measures the manifest behavioral activity level based on the mechanical demands, dynamic torque, and pivot-shift stress exerted upon the lower extremity. The instrument synthesizes occupational exertion, domestic locomotion, recreational sports, and elite competitive athletics into a standardized, hierarchical continuum of physical functioning.

Hierarchy of Physical Demands and Biomechanical Stress

The construct operationalizes functional exposure across three distinct tiers:

• Occupational and Ambulatory Exertion (Levels 0–4): This foundational tier assesses the individual’s baseline capacity for basic locomotion and occupational function. At Level 0, functional incapacity is complete due to musculoskeletal distress (e.g., medical leave, permanent disability). Level 1 establishes the baseline for sedentary employment requiring minimal locomotion on flat surfaces. Levels 2 and 3 integrate variable environmental terrain (uneven ground) and light occupational labor (e.g., nursing, ambulatory service occupations), introducing cyclic weight-bearing demands without rotary stress. Level 4 represents moderately heavy physical labor (e.g., truck driving, agricultural or heavy domestic work) combined with low-impact recreational aerobic exercise (jogging on even ground, flat-surface cycling).
• Recreational Sports and Heavy Labor (Levels 5–7): This intermediate tier introduces moderate-to-high shear forces and multi-planar joint displacement. Level 5 encompasses heavy manual occupational labor (e.g., construction, forestry) alongside non-pivoting aerobic exercise on uneven outdoor terrain (trail jogging at least twice weekly). Levels 6 and 7 demand deliberate agility, rapid acceleration/deceleration, and intermittent pivoting, including recreational racket sports (tennis, badminton), downhill skiing, and competitive participation in linear or non-collision disciplines (e.g., cross-country running, speedway).
• High-Impact Competitive Pivoting Sports (Levels 8–10): The highest tier is characterized by extreme biomechanical loading, unpredictable multi-directional cutting maneuvers, rapid deceleration, and direct physical collisions. Level 8 incorporates sports requiring severe rotary knee stability, such as squash, competitive racquetball, downhill ski racing, and track-and-field jumping events. Level 9 captures competitive contact sports (soccer, football, rugby, ice hockey, wrestling, gymnastics) at regional, collegiate, or sub-elite division levels. Level 10 represents the pinnacle of athletic demand: national or international elite-level competition in collision and pivoting sports, placing maximal physiological, neuromuscular, and psychological strain on the musculoskeletal apparatus.

6. Theoretical Framework

The Tegner Score is anchored in the theoretical convergence of biomechanical joint kinetics, the International Classification of Functioning, Disability and Health (ICF) framework developed by the World Health Organization (WHO), and behavioral adaptation theories within orthopedic psychology.

The ICF Biopsychosocial Model Integration

Under the WHO ICF model, human health outcomes are categorized across three interdependent levels: Body Functions and Structures (impairments), Activities (limitations), and Participation (restrictions). Traditional orthopedic outcome measures focus heavily on Body Structures (e.g., ligamentous laxity measured via arthrometers, cartilage degeneration observed via magnetic resonance imaging) and symptom-level Body Functions (pain, joint effusion, catching sensations). In contrast, the Tegner Score functions explicitly at the interface of Activity (execution of motor tasks like running, jumping, and cutting) and Participation (involvement in vocational and athletic life situations).

Importantly, the theoretical framework recognizes that activity level mediates the relationship between impairment and symptom severity. An individual with significant structural knee impairment may experience zero symptoms if they adaptively restrict their participation to Level 1 (sedentary work). Conversely, a patient with mild residual impairment may experience recurrent episodes of pain or giving-way if attempting to function at Level 9 or 10. Thus, the Tegner Score serves as the necessary contextual denominator for interpreting patient-reported joint performance.

Biomechanical Kinematics and Pivoting Mechanics

The graduated progression from Level 0 to Level 10 reflects an ascending gradient of mechanical joint load, external knee abduction moments, anterior tibial shear force, and internal rotary torque. Foundational biomechanical research indicates that straight-line locomotion (jogging, cycling; Levels 4–5) induces primarily sagittal plane forces that do not require complex neuromuscular stabilization against rotational subluxation. Conversely, sports represented in Levels 7–10 (soccer, basketball, squash) demand high-velocity cutting maneuvers, lateral perturbation control, and sudden deceleration, which generate intense multi-planar knee loading. The structural ordering of the scale directly mirrors these empirical kinetic and kinematic thresholds.

7. Validity

The psychometric validity of the Tegner Score has been extensively evaluated across diverse patient cohorts, surgical interventions, and cultural adaptations, confirming its robustness as an indicator of functional activity exposure.

Construct and Convergent Validity

Construct validity is substantiated through hypothesized correlations with other validated patient-reported outcome measures and functional objective physical tests:

• Correlation with Joint-Specific Instruments: Multiple prospective studies document moderate-to-high positive correlations between the Tegner Score and the International Knee Documentation Committee (IKDC) Subjective Knee Form ($r = 0.45\text{ to }0.68$, $p < 0.001$), reflecting that higher subjective joint function facilitates higher physical activity.
• Correlation with the Marx Activity Scale: Validation studies comparing the Tegner Score to the Marx Activity Rating Scale—which independently quantifies the frequency of running, cutting, decelerating, and pivoting—report strong convergent validity ($r = 0.58\text{ to }0.74$, $p < 0.001$), supporting the conceptual overlap of the underlying activity constructs.
• Functional Performance Correlation: Patients achieving higher postoperative Tegner scores demonstrate significantly higher Limb Symmetry Indices (LSI) on single-leg hop for distance, triple hop for distance, and timed 6-meter hop tests ($r = 0.41\text{ to }0.56$), confirming that subjective self-selection of activity corresponds with objective neuromuscular performance.

Discriminant and Known-Groups Validity

The Tegner Score demonstrates exceptional known-groups discriminant validity. Studies comparing healthy athletic controls to patients with acute anterior cruciate ligament tears, chronic meniscal pathology, or end-stage knee osteoarthritis show statistically significant, large-magnitude differences in mean scores ($p < 0.001$, Cohen’s $d > 1.2$). Healthy young athletic populations typically demonstrate baseline median scores of 7 to 9, whereas preoperative ACL-deficient cohorts exhibit median current scores of 2 to 4, accompanied by pre-injury retrospective scores corresponding to the healthy distribution. Furthermore, the instrument effectively discriminates between elite-level athletes, recreational competitors, and non-athletic manual or clerical laborers.

Predictive and Evaluative Validity

Pre-injury Tegner scores possess strong predictive validity regarding clinical outcomes following reconstructive surgery. High pre-injury activity levels (Tegner $ge 7$) are significant independent predictors of patient motivation, successful return-to-sport rates, and subjective functional recovery. Simultaneously, high postoperative Tegner scores are associated with an elevated risk of secondary graft failure or contralateral ACL injury, directly validating the theoretical construct that higher Tegner levels correspond to increased biomechanical joint exposure.

8. Reliability

Given that the Tegner Score is a single-item ordinal scale, traditional metrics of internal consistency (such as Cronbach’s alpha or McDonald’s omega) are mathematically inapplicable. Consequently, psychometric reliability appraisal focuses primarily on test-retest stability, inter-rater concordance, and measurement error indices.

Test-Retest Reliability

Empirical studies across numerous languages and clinical cohorts demonstrate outstanding test-retest reliability across short (24–48 hours) and moderate (1–2 weeks) re-administration intervals:

• Intraclass Correlation Coefficients: Published literature reports ICC values ranging between 0.82 and 0.97. For example, Briggs et al. reported an ICC of 0.82 (95% CI: 0.73–0.88) in a diverse cohort of patients undergoing orthopedic knee interventions.
• Weighted Kappa Statistics: In studies treating the scale as an ordinal variable, quadratic weighted Cohen’s Kappa ($\kappa_w$) coefficients routinely fall between 0.70 and 0.88, demonstrating substantial to almost perfect agreement across repeated administrations.

Measurement Error and Responsiveness

The standard error of measurement (SEM) for the Tegner Score is estimated at approximately 0.5 to 0.8 points. The Minimal Detectable Change at the 95% confidence level ($MDC_{95}$) is calculated across various validation trials between 1.0 and 1.5 points. Consequently, a shift of at least 1 full level (and conservatively 2 levels) is required to infer a true, clinically meaningful change beyond measurement fluctuation. The scale exhibits excellent responsiveness to interventions that restore stability, demonstrating large effect sizes (standardized response mean, $SRM > 0.90$) following successful reconstructive knee surgery and targeted athletic reconditioning.

9. Factor Analysis

In standard psychometric test development, multi-item batteries undergo exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) to identify latent dimensional constructs, examine cross-loadings, and verify overall model fit through structural equation modeling (SEM). Because the Tegner Score consists of a single graduated 11-level rating item, conventional covariance-based factor analytic matrices cannot be computed.

Item Response Theory and Guttman Scalogram Analysis

To evaluate the structural integrity and unidimensionality of the scale’s graduated ordering, researchers have employed non-parametric Item Response Theory (IRT) and Guttman scaling models. These analyses treat each ascending activity level as a hierarchical threshold reflecting latent mechanical and physical demand ($\theta$):

• Monotonicity and Scalogram Reproducibility: Guttman scalogram investigations demonstrate a Coefficient of Reproducibility exceeding 0.90, confirming that an individual capable of functioning at a higher activity level (e.g., Level 8: competitive squash) almost universally retains the functional capacity required for lower levels (e.g., Level 4: moderate domestic labor and flat-ground jogging).
• Threshold Separation: Non-parametric IRT models indicate clear category ordering across thresholds with minimal category disordering, verifying that each increment from 0 to 10 represents a distinct, non-redundant increase in joint demand and physical performance.
• Unidimensional Hierarchy: Clinimetric mapping studies confirm that the continuum cleanly operationalizes a single underlying dimension: the magnitude of physical stress, rotary torque, and athletic demand applied to the lower extremity.

10. Instrument / Measurement Tool

• Test Type: Patient-Reported Outcome Measure (PROM) / Single-item graduated activity rating scale.
• Administration Format: Self-administered (paper-and-pencil or digital/electronic survey format); can also be clinician-administered during structured clinical interviews.
• Target Population: Adolescents and adults presenting with lower extremity conditions, knee ligament or meniscal injuries, cartilage pathology, patellofemoral disorders, or post-surgical orthopedic interventions.
• Item Count: 1 single multi-tiered graduated item.
• Response Scale: Single-item graduated activity rating scale from Level 10 (highest activity level) to Level 0 (lowest activity level / disability).
• Completion Time: Approximately 1 to 2 minutes.
• Scoring Rules:
  • The instrument produces a single integer score ranging from 0 to 10, directly matching the activity level chosen by the patient.
  • Higher numerical scores reflect higher levels of physical activity, greater mechanical joint loading, and participation in higher-level competitive sports.
  • No reverse scoring, item weighting, or complex transformation algorithms are required.
  • In longitudinal evaluations, the instrument is frequently completed twice: first to document the pre-injury baseline level, and second to measure the current functional level.

11. Permissions & Fee and Test Year

The Tegner Score was originally conceptualized and published in 1985 by Yelverton Tegner and Jack Lysholm in Clinical Orthopaedics and Related Research. The instrument is considered an open-access clinical assessment tool and is situated in the public domain for academic, non-commercial clinical, and non-commercial research use. No licensing fees or formal permissions are required for clinical practice or individual academic studies, provided that appropriate scholarly attribution is accorded to the original authors. Commercial deployments, integration within proprietary health-technology software, or inclusion in sponsored clinical pharmaceutical trials should adhere to general copyright compliance standards regarding the published literature.

12. References

Below is a comprehensive list of foundational and psychometric validation literature in APA 7th edition format:

• Briggs, K. K., Lysholm, J., Tegner, Y., Rodkey, W. G., Steadman, J. R., & Roos, E. M. (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. (2009). Lysholm score and Tegner activity level in individuals with normal knees. The American Journal of Sports Medicine, 37(5), 898–901. https://doi.org/10.1177/0363546508330149
• Lysholm, J., & Tegner, Y. (2007). Knee injury rating scales. Acta Orthopaedica, 78(4), 445–453. https://doi.org/10.1080/17453670710014068
• Marx, R. G., Stump, T. J., Jones, E. C., Wickiewicz, T. L., & Warren, R. F. (2001). Development and evaluation of an activity rating scale for disorders of the knee. The American Journal of Sports Medicine, 29(2), 213–218. https://doi.org/10.1177/03635465010290021601
• 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

13. Items of the Scale (Questionnaire)