Dynamic Gait Index (DGI)

The Dynamic Gait Index (DGI) was developed to assess an individual’s ability to adapt balance while walking under various external demands. It provides a detailed evaluation of gait function and balance in both standardized and challenging tasks. DGI was specifically designed to evaluate fall risk in older adults but is also widely used for clinical conditions such as stroke, Parkinson’s disease, vestibular disorders, traumatic brain injury, and multiple sclerosis.

Test structure and scoring

DGI consists of eight tasks that focus on dynamic balance challenges, including:

• Walking on a flat surface

• Changing gait speed

• Horizontal and vertical head turns while walking

• Stepping over and around obstacles

• Pivot turns while walking

• Ascending and descending stairs

Each task is scored on a 4-point scale:

• 3 points: No gait dysfunction

• 2 points: Minimal impairment

• 1 point: Moderate impairment

• 0 points: Severe impairment

Maximum score: 24 points

• <19 points: Increased fall risk

• >22 points: Safe ambulator

Psychometric properties

Validity

Construct validity

• Berg Balance Scale (BBS): Strong correlation (r = 0.67–0.83), indicating both tests measure related aspects of balance【1】【2】.

• Activities-specific Balance Confidence (ABC) scale: Moderate to strong correlation (r = 0.54–0.68), reflecting the test’s ability to relate to balance confidence【2】.

Discriminative validity

• Fallers with Parkinson’s disease score significantly lower (16.1 ± 3.4) compared to non-fallers (19.6 ± 2.6)【3】.

• In older adults, a cut-off score of <19 points is associated with increased fall risk (specificity 86%, sensitivity 67%)【4】.

Responsiveness

• Stroke: Effect size 0.56–0.62 after rehabilitation → moderate ability to detect meaningful clinical improvements【5】.

• Parkinson’s disease: Effect size 1.77 with rhythmic auditory training → strong responsiveness in this population【6】.

Reliability

Test–retest reliability

• Stroke: ICC = 0.94–0.98 → excellent reliability【5】【7】.

• Vestibular disorders: ICC = 0.86 → strong reliability in this population【8】.

Interrater and intrarater reliability

• Older adults: ICC = 0.92 (interrater), ICC = 0.90 (intrarater)【4】.

• Stroke patients: ICC = 0.96 (interrater), ICC = 0.97 (intrarater)【7】.

Other measurement properties

• Standard Error of Measurement (SEM):

  • Stroke: 0.71–0.97 points【5】【7】

  • Older adults: 1.04 points【4】

• Minimal Detectable Change (MDC):

  • Stroke: 2.6–4.0 points depending on study population【5】【7】

  • Older adults: 2.9 points【4】

• Ceiling and floor effects:

  • Vestibular disorders: Moderate ceiling effect (16.9%), especially in populations with mild impairment【8】

  • Older adults: 40% ceiling effect at baseline, reduced after intervention【4】

Clinical implications

DGI is a reliable and valid tool for assessing dynamic balance and fall risk across diverse patient populations. While ceiling effects may pose challenges in some groups, its simple administration, low cost, and wide applicability make it a valuable part of rehabilitation practice. For patients with more complex balance deficits, the Functional Gait Assessment (FGA) may be a better alternative due to higher specificity and fewer ceiling effects.

Advantages and limitations

Advantages:

• Easy to administer (10–15 minutes)

• Requires minimal equipment: shoebox, cones, stairs, and a 20-foot walkway

• Freely available and easy to learn

Limitations:

• Ceiling effect: High-functioning patients may reach maximum scores without challenge → FGA is recommended as an alternative.

• Specificity: Lower specificity for predicting falls compared to tests like Timed Up and Go (TUG).

Clinical use and recommendations

DGI is recommended by several professional organizations, including the Neurology Section of the American Physical Therapy Association (APTA), for rehabilitation in:

• Stroke: Strongly recommended (>6 months post-stroke)

• Parkinson’s disease: Recommended for Hoehn–Yahr stages I–IV (not stage V)

• Vestibular disorders: Recommended in acute, subacute, and chronic phases

Conclusion

The Dynamic Gait Index (DGI) is a valuable tool for assessing gait and balance under dynamic conditions. With its wide applicability and strong psychometric properties, DGI remains a standard in clinical practice for identifying fall risk and monitoring progress in rehabilitation.

Sources:

Chui KC, Jorge M, Yen SC, Lusardi MM. Orthotics and Prosthetics in Rehabilitation E-Book. Elsevier Health Sciences; 2019 Jul 6.Available from:https://www.sciencedirect.com/topics/medicine-and-dentistry/dynamic-gait-index (accessed 11.3.2021)

1. Jonsdottir J, Cattaneo D. Reliability and validity of the dynamic gait index in persons with chronic stroke. Arch Phys Med Rehabil. 2007 Nov;88(11):1410-5.

2. Wrisley D, Walker M, Echternach J, Strasnick B. Reliability of the Dynamic Gait Index in people with vestibular disorders. Arch Phys Med Rehabil. 2003;84:1528–1533

3. 16McConvey J, Bennett S. Reliability of the Dynamic Gait Index in individuals with multiple sclerosis. Arch Phys Med Rehabil. 2005;86:130–133.

4. Herman T, Inbar-Borovsky N, Brozgol M, Giladi N, Hausdorff JM. The Dynamic Gait Index in healthy older adults: the role of stair climbing, fear of falling and gender. Gait Posture. 2009 Feb;29(2):237-41. Epub 2008 Oct 8.

5. Lin, J. H., Hsu, M. J., et al. (2010). Psychometric comparisons of 3 functional ambulation measures for patients with stroke. Stroke 41(9): 2021-2025

6. Cattaneo, D., Regola, A., et al. (2006). Validity of six balance disorders scales in persons with multiple sclerosis. Disability and Rehabilitation 28(12): 789-795

7. Herdman SJ. Vestibular Rehabilitation. 2nd ed. Philadelphia, PA: F.A.Davis Co; 2000.

8. Shumway-Cook A, Woollacott M. Motor Control Theory and Applications, Williams and Wilkins Baltimore, 1995: 323-324.

9. AV Verleih. Dynamic Gait Index.AVI. Available from: http://www.youtube.com/watch?v=JtnjfsVnPsY[last accessed 25/05/13]

10. Lin JH, Hsu MJ, Hsu HW, Wu HC, Hsieh CL. Psychometric Comparisons of 3 Functional Ambulation Measures for Patients With Stroke. Stroke. 2010 Jul 29; online article ahead of print

11. Marchetti GF, Whitney SL, Blatt PJ, Morris LO, Vance JM. Temporal and spatial characteristics of gait during performance of the Dynamic Gait Index in people with and people without balance or vestibular disorders. Physical Therapy, 2008 May;88(5):640-51.