Fugl-Meyer Assessment

1. Abstract

The Fugl-Meyer Assessment (FMA) of Motor Recovery is an established, stroke-specific, performance-based quantitative measure designed to assess sensorimotor impairment in individuals following a cerebrovascular accident (CVA). Developed by Axel R. Fugl-Meyer and colleagues in 1975, the assessment is conceptually grounded in Signe Brunnstrom’s stages of motor recovery, which conceptualize post-stroke recovery as an orderly progression from initial flaccidity and basic stereotypic movement synergies toward isolated, volitional joint control. Although the full protocol includes motor functioning, sensation, passive joint motion, and joint pain, clinical neurology and neurorehabilitation research primarily prioritize the motor evaluation components. The motor scale features 50 items divided into two primary subscales: the Upper Extremity subscale (comprising 33 items spanning reflex activity, volitional movement within and out of synergy, wrist control, hand grasp dexterity, and coordination/speed; total score 0–66) and the Lower Extremity subscale (comprising 17 items evaluating reflexes, flexor and extensor synergies, isolated movements, and lower limb coordination/speed; total score 0–34), culminating in a maximum motor score of 100.

Each item is evaluated on a standardized 3-point ordinal scale (0 = Cannot be performed, 1 = Performed partially, 2 = Performed faultlessly), operationalized through strict behavioral and biomechanical criteria. Extensive psychometric evaluations across acute, subacute, and chronic stroke cohorts confirm exceptional structural integrity, with Cronbach’s alpha coefficients routinely exceeding 0.95, intra-rater and inter-rater reliability intraclass correlation coefficients (ICCs) consistently exceeding 0.90, and outstanding construct validity evidenced through strong convergent correlations with the Action Research Arm Test (ARAT), the Wolf Motor Function Test (WMFT), and kinematic kinematic motion capture metrics. This article provides an exhaustive psychometric, theoretical, and clinical review of the Fugl-Meyer Assessment.

2. Keywords

Fugl-Meyer Assessment, stroke rehabilitation, motor impairment, hemiplegia, Brunnstrom stages, upper extremity recovery, lower extremity motor function, psychometrics, neurorehabilitation, outcome measurement

3. Authors

The Fugl-Meyer Assessment was originated by Axel R. Fugl-Meyer, MD, PhD, along with his distinguished multidisciplinary team comprising Lisbeth Jääskö, Ingegerd Leyman, Sigbritt Olsson, and Steg Steglind at the Department of Physical Medicine and Rehabilitation, University of Göteborg, Sahlgrenska University Hospital, Sweden. Dr. Fugl-Meyer was a seminal figure in European physical medicine and rehabilitation, dedicating decades of clinical investigation to quantitative motor evaluation and rehabilitation medicine methodology.

Regional adaptations and standardized guideline integrations have further refined the administration protocol over subsequent decades. Notably, the Royal Dutch Society for Physical Therapy (Koninklijk Nederlands Genootschap voor Fysiotherapie; KNGF) incorporated validated clinical guidelines for stroke rehabilitation (KNGF-richtlijn Beroerte, 2004), confirming the removal of redundant balance subtests and refining the scoring rubrics for upper and lower extremity motor function in physical therapy practice.

4. Purpose

The fundamental purpose of the Fugl-Meyer Assessment is to provide a rigorous, objective, and reproducible quantitative metric of motor impairment in patients who have sustained central nervous system lesions due to stroke. In neurorehabilitation, distinguishing between impairment (loss of biological function or body structure) and activity limitation (inability to execute a task, such as drinking from a cup or walking a specific distance) is vital. While measures such as the Functional Independence Measure (FIM) or the Barthel Index quantify overall independence, they often obscure compensatory movements (e.g., trunk leaning or reliance on the unaffected limb). The Fugl-Meyer Assessment isolates pure motor recovery and elemental motor control, providing researchers and clinicians with unconfounded measurements of physiological restoration versus behavioral compensation.

Clinically, the instrument serves multiple interrelated objectives:

• Baseline Stratification and Prognostication: Administering the FMA during the acute or early subacute phases allows clinicians to classify motor deficits into established severity tiers (e.g., very severe, severe, moderate, and mild), which correlate with long-term functional recovery potential and facilitate personalized neurorehabilitative pathways.
• Monitoring Neuroplastic Reorganization: Because the items mirror hierarchical stages of central nervous system reorganizational capacity, serial administration detects fine-grained improvements in motor fractionization, reduction of pathological synergies, and restoration of speed and coordination.
• Clinical Trial Efficacy Endpoint: The FMA is the international “gold standard” primary or secondary outcome measure in neurorestorative pharmacological trials, robotic exoskeleton interventions, virtual reality motor therapies, non-invasive brain stimulation (e.g., transcranial magnetic stimulation and tDCS), and intensive task-oriented physical and occupational therapies.
• Therapeutic Prescription: By pinpointing the exact phase at which isolated joint movement breaks down (such as an inability to perform forearm pronation/supination with an extended elbow), clinicians can target exercises that dissociate muscle synergies.

5. Psychological Construct

The core construct evaluated by the Fugl-Meyer Assessment is neuromotor recovery of voluntary motor control following a hemiplegic cerebral lesion. Rather than conceptualizing motor ability as a monolithic capacity, the scale models motor function across distinct neurophysiological domains that reflect progressive stages of central nervous system reorganization.

Upper Extremity Domain (Items 1–33; Score 0–66)

The upper extremity construct encompasses five hierarchically organized subdomains:

• Reflex Activity: Evaluates the initial return of deep tendon reflexes (biceps and triceps). Flaccidity signifies the earliest post-stroke phase, whereas reflex emergence marks the transition toward hyperreflexia and spastic muscle control.
• Volitional Movement Within Synergies: Measures the patient’s capacity to initiate and complete gross stereotypic co-contractions. The flexor synergy involves shoulder retraction, elevation, abduction to at least 90°, external rotation, elbow flexion, and forearm supination. The extensor synergy couples shoulder adduction/internal rotation, elbow extension, and forearm pronation. Patients demonstrate basic descending motor commands that remain bound to primitive motor patterns.
• Volitional Movement Combining Synergies: Assesses intermediate recovery where the cortex begins to uncouple primitive synergies, demonstrated by movements such as placing the hand behind the lumbar spine, performing shoulder flexion to 90° with an extended elbow, and supinating/pronating the forearm with the elbow flexed at 90°.
• Volitional Movement Out of Synergy: Evaluates sophisticated corticospinal tract integrity through isolated joint movements that diverge from pathological synergies, such as abducting the shoulder to 90° with a pronated forearm, flexing the shoulder past 90° up to 180°, and executing isolated forearm pronation/supination with the elbow fully extended.
• Normal Reflex Activity: Evaluates the normalization of hyperactive deep tendon reflexes once voluntary stage V control is achieved, verifying whether motor recovery has reached physiological equilibrium.
• Wrist and Hand Subcomponents: Assesses fine distal motor control, including wrist stability during sustained isometric resistance, active dynamic wrist flexion/extension, and five specialized grasp archetypes (hook, lateral, palmar prehension, cylindrical, and spherical grasps).
• Coordination and Speed: Assesses motor smoothness, dysmetria, and movement velocity via a rapid finger-to-nose task compared quantitatively and qualitatively against the unimpaired contralateral upper extremity.

Lower Extremity Domain (Items 34–50; Score 0–34)

Paralleling the arm assessment, the lower extremity construct explores gross and fractional motor control across four progressive stages:

• Lower Extremity Reflexes: Evaluates deep tendon responsiveness in the Achilles and patellar reflexes.
• Lower Extremity Synergies: Assesses gross flexion synergy (hip flexion, knee flexion, ankle dorsiflexion) and extension synergy (hip extension, hip adduction, knee extension, ankle plantarflexion) in the supine position.
• Movement Combining and Moving Out of Synergies: Assesses uncoupled motor behaviors, such as flexing the knee beyond 90° while seated with the foot sliding backward, isolated seated ankle dorsiflexion, standing knee flexion to 90° with the hip maintained in neutral extension, and isolated standing ankle dorsiflexion with the knee fully extended.
• Coordination and Speed: Evaluates cerebellar and corticospinal integration through the heel-to-shin test, monitoring for intentional tremor, terminal dysmetria, and temporal discrepancies relative to the unaffected limb.

6. Theoretical Framework

The theoretical architecture of the Fugl-Meyer Assessment rests primarily on the neurodevelopmental and motor recovery theories formulated by Swedish physical therapist Signe Brunnstrom in the mid-20th century, combined with classical hierarchical models of motor control proposed by Sir Charles Sherrington and John Hughlings Jackson.

Hughlings Jackson posited that the central nervous system is organized hierarchically, with phylogenetically newer structures (the cerebral cortex and corticospinal tracts) exerting inhibitory control over older subcortical and spinal motor centers. A catastrophic cortical or subcortical ischemic or hemorrhagic lesion causes “dissolution” of this hierarchy, releasing primitive, stereotyped spinal and brainstem motor programs from supraspinal inhibition. Consequently, post-stroke hemiplegia exhibits stereotypic co-activation patterns—termed mass movement synergies—in which individual joint movement cannot be decoupled from adjacent joint actions.

Brunnstrom described recovery from stroke hemiplegia as traversing an orderly progression of six clinical stages:

1. Stage 1 (Flaccidity): Complete absence of voluntary movement and deep tendon reflexes.
2. Stage 2 (Spasticity Appears): Basic flexor and extensor synergies emerge involuntarily or as associated reactions; spasticity begins to develop.
3. Stage 3 (Voluntary Synergy Control): Synergies can be initiated voluntarily; spasticity reaches its peak intensity.
4. Stage 4 (Movements Deviating from Synergy): Spasticity begins to decline; motor control uncouples slightly, allowing initial combinations out of stereotypic patterns.
5. Stage 5 (Relative Independence of Synergy): Spasticity declines markedly; complex, isolated joint movements become increasingly possible.
6. Stage 6 (Isolated Movement and Normal Coordination): Individual joint movements become smooth, fractionated, and well-coordinated, with near-normal speed and disappearance of hyperreflexia.

Axel Fugl-Meyer operationalized Brunnstrom’s qualitative clinical observations into an objective, standardized psychometric instrument. Fugl-Meyer hypothesized that if post-stroke motor restitution systematically follows this sequential neurophysiological trajectory, scale items should conform to a cumulative, hierarchical Guttman-like structure: a patient unable to complete Stage 3 movements should consistently fail Stage 4 and 5 items.

7. Validity

The Fugl-Meyer Assessment is widely regarded as possessing some of the strongest construct, concurrent, and predictive validity profiles of any outcome measure in physical medicine and rehabilitation.

Construct and Structural Validity

Extensive Rasch analyses and item response theory (IRT) investigations confirm that the FMA items form a continuous, unidimensional continuum of motor difficulty that mirrors Brunnstrom’s neurodevelopmental hierarchy. Woodbury et al. (2007, 2008) conducted Rasch analyses on the FMA Upper Extremity subscale, showing that items fit the unidimensional model with acceptable infit and outfit statistics (mean square values between 0.7 and 1.3), verifying that the items reflect a single underlying construct of motor impairment.

Convergent and Concurrent Validity

Concurrent validity has been verified against numerous motor and functional assessments. The Upper Extremity (FMA-UE) subscale correlates strongly with the Action Research Arm Test (ARAT) (Pearson’s r typically ranging from 0.86 to 0.94), the Box and Block Test (r = 0.80–0.89), and the Wolf Motor Function Test (WMFT) (r = 0.82–0.92). Kinematic studies using 3D optoelectronic motion capture demonstrate significant negative correlations between FMA-UE scores and measures of compensatory trunk displacement during reaching tasks (r = -0.73, p < 0.001), showing that higher FMA scores directly indicate true motor fractionization rather than compensatory adjustments. The Lower Extremity (FMA-LE) subscale correlates with gait velocity (r = 0.55–0.78), the Berg Balance Scale (r = 0.62–0.84), and the 6-Minute Walk Test (6MWT) (r = 0.58–0.72).

Predictive Validity

Early post-stroke FMA scores serve as powerful predictors of functional recovery at 3, 6, and 12 months. Prabhakaran et al. (2008) articulated the “proportional recovery model,” which established that in patients with an intact corticospinal tract (evaluated via motor-evoked potentials), post-stroke motor improvement from the acute baseline to 3 months accounts for approximately 70% of the maximum potential recovery headroom: $\Delta\text{FMA} \approx 0.70 \times (66 – \text{FMA}_{\text{baseline}})$. This mathematical predictability underscores the scale’s physiological validity.

8. Reliability

The reliability of the Fugl-Meyer Assessment has been evaluated across acute, subacute, and chronic stroke samples, with consistent evidence of internal consistency, stability, and inter-examiner reproducibility.

Internal Consistency

The internal consistency of the motor components is uniformly high. Cronbach’s alpha values for the Upper Extremity subscale range from 0.94 to 0.98 across multiple studies (Duncan et al., 1983; Gladstone et al., 2002). The Lower Extremity subscale yields Cronbach’s alpha values ranging from 0.89 to 0.93. The combined motor scale yields reliability coefficients routinely exceeding 0.96.

Inter-Rater and Intra-Rater Reliability

Inter-rater reliability studies indicate high concordance among physical therapists, occupational therapists, and neurologists who have received standard training. Intraclass correlation coefficients (ICCs) for inter-rater agreement on the FMA-UE range between 0.95 and 0.99, with lower bounds of 95% confidence intervals rarely dropping below 0.92. For the FMA-LE, inter-rater ICCs range between 0.86 and 0.96. Intra-rater (test-retest) reliability is similarly high, with test-retest ICCs over 48 to 72 hours ranging from 0.96 to 0.99 for the upper limb and 0.90 to 0.95 for the lower limb.

Measurement Error and Responsiveness

The standard error of measurement (SEM) for the FMA-UE is approximately 1.4 to 2.2 points, yielding a Minimal Detectable Change at the 95% confidence level ($MDC_{95}$) of 3.2 to 5.2 points. The Minimal Clinically Important Difference (MCID) has been established by Page et al. (2012) in chronic stroke as 4.25 to 7.25 points for the upper extremity, confirming that the scale is sensitive to true neurobiological and clinically meaningful improvements.

9. Factor Analysis

Structural evaluations using both exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) clarify the scale’s multidimensional yet unified psychometric architecture.

Exploratory Factor Analysis

Early exploratory factor analyses by Wood-Dauphinee et al. (1990) and subsequent contemporary investigations extracted distinct structural components. In the upper extremity domain, EFA consistently reveals two primary factors explaining over 70% of the total variance: a proximal motor factor (encompassing shoulder, elbow, and forearm items related to flexor and extensor synergies) and a distal motor factor (encompassing wrist stability, finger mass movement, and prehension grasp patterns). A third, smaller factor accounting for coordination and speed (finger-to-nose dysmetria, tremor, and time) routinely emerges.

Confirmatory Factor Analysis and Structural Equation Modeling

Confirmatory factor analyses testing hierarchical and bifactor models provide strong empirical support for a single general factor of motor recovery along with distinct domain-specific factors. CFA indices frequently demonstrate good to excellent goodness-of-fit:

• Comparative Fit Index (CFI) > 0.94
• Tucker-Lewis Index (TLI) > 0.93
• Root Mean Square Error of Approximation (RMSEA) < 0.065 (90% CI: 0.051–0.078)
• Standardized Root Mean Square Residual (SRMR) < 0.052

These findings validate reporting both a global motor summary score and specific subscores (e.g., FMA-UE and FMA-LE) in clinical trials.

10. Instrument / Measurement Tool

• Instrument Type: Standardized, clinician-administered, performance-based observational assessment of motor impairment.
• Target Population: Adult and elderly individuals with hemiparesis or hemiplegia secondary to stroke or traumatic brain injury.
• Administration Time: Approximately 30 to 45 minutes for the combined motor assessment; roughly 20 to 30 minutes for the Upper Extremity subscale alone.
• Required Materials: Reflex hammer, bedside examination table/mat, stable chair without armrests, tennis ball, small pencil, paper strip/index card, round cylinder/can, stopwatch, and blindfold/eye mask.
• Total Motor Item Count: 50 motor items (33 upper extremity items, 17 lower extremity items).
• Response Scale: 3-point ordinal scale:
  • 0 = Cannot be performed: Complete inability to initiate the requested movement or absence of required reflex response.
  • 1 = Performed partially: Movement initiated and completed through part of the range of motion, completed with significant synergy intrusion, or performed with marked compensatory patterns.
  • 2 = Performed faultlessly: Movement completed smoothly and fully throughout the complete physiological range of motion without synergy co-activation, dysmetria, or significant hesitation.
• Scoring Hierarchy and Range:
  • Upper Extremity Total: 0 to 66 points (Items 1–33).
  • Lower Extremity Total: 0 to 34 points (Items 34–50).
  • Total Motor Score: 0 to 100 points.
• Clinical Severity Cutoffs (Upper Extremity Motor Score):
  • 0 to 28 points: Very severe motor impairment.
  • 29 to 42 points: Severe motor impairment.
  • 43 to 55 points: Moderate motor impairment.
  • 56 to 66 points: Mild motor impairment.

11. Permissions & Fee and Test Year

The Fugl-Meyer Assessment was originally published in 1975 by Axel R. Fugl-Meyer and colleagues in the Scandinavian Journal of Rehabilitation Medicine. Because it was developed as an open clinical and academic assessment, the Fugl-Meyer Assessment is in the public domain and does not require commercial licensing fees or proprietary software purchases for academic, clinical, or research use. Standardized scoring sheets, detailed manual protocols, and instructional training videos are maintained and distributed freely by the University of Gothenburg Department of Rehabilitation Medicine and academic consortia worldwide.

12. References

• Brunnstrom, S. (1970). Movement therapy in hemiplegia: A neurophysiological approach. Harper & Row.
• Duncan, P. W., Propst, M., & Nelson, S. G. (1983). Reliability of the Fugl-Meyer Assessment of sensorimotor recovery following cerebrovascular accident. Physical Therapy, 63(10), 1606–1610. https://doi.org/10.1093/ptj/63.10.1606
• Fugl-Meyer, A. R., Jääskö, L., Leyman, I., Olsson, S., & Steglind, S. (1975). The post-stroke hemiplegic patient. 1. A method for evaluation of physical performance. Scandinavian Journal of Rehabilitation Medicine, 7(1), 13–31. https://pubmed.ncbi.nlm.nih.gov/1135616/
• Gladstone, D. J., Danells, C. J., & Black, S. E. (2002). The Fugl-Meyer Assessment of motor recovery after stroke: A critical review of its measurement properties. Neurorehabilitation and Neural Repair, 16(3), 232–240. https://doi.org/10.1177/154596802401105271
• Koninklijk Nederlands Genootschap voor Fysiotherapie (KNGF). (2004). KNGF-richtlijn Beroerte [KNGF clinical practice guideline for stroke]. Nederlands Tijdschrift voor Fysiotherapie, 114(Suppl. 5), 1–72.
• Page, S. J., Fulk, G. D., & Boyne, P. (2012). Clinically important differences for the upper-extremity Fugl-Meyer Assessment in chronic stroke. Neurorehabilitation and Neural Repair, 26(7), 798–804. https://doi.org/10.1177/1545968311430540
• Prabhakaran, S., Zarahn, E., Riley, C., Speizer, A., Chong, J. Y., Lazar, R. M., Marshall, R. S., & Krakauer, J. W. (2008). Inter-individual variability in the capacity for motor recovery after ischemic stroke. Neurorehabilitation and Neural Repair, 22(1), 64–71. https://doi.org/10.1177/1545968307305302
• Woodbury, M. L., Velozo, C. A., Richards, L. G., & Duncan, P. W. (2007). Rasch analysis staging of the Fugl-Meyer Assessment of upper extremity recovery after stroke. Physical Therapy, 87(7), 882–894. https://doi.org/10.2522/ptj.20060268
• Woodbury, M. L., Velozo, C. A., Richards, L. G., Duncan, P. W., Studenski, S., & Lai, S. M. (2008). Dimensionality and construct validity of the Fugl-Meyer Assessment of the upper extremity. Medical Care, 46(7), 715–723. https://doi.org/10.1097/MLR.0b013e3181648eed
• Wood-Dauphinee, S. L., Shapiro, S. H., Bass, E., Fletcher, C., Georges, P., Hensby, V., & Mendelsohn, B. (1990). Physical therapy in stroke: Can it alter the natural history of recovery? Stroke, 21(8), 1186–1193. https://doi.org/10.1161/01.str.21.8.1186

13. Items of the Scale