What is the Modified‑Modified Ashworth Scale (MMAS) and how is it scored and used to assess spasticity?

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Last updated: April 7, 2026 • View editorial policy

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Modified Modified Ashworth Scale (MMAS)

The Modified Modified Ashworth Scale (MMAS) is a clinical tool that quantifies spasticity by measuring resistance to passive movement on a 0-4 scale, where higher scores indicate greater severity, and can be administered in approximately 10 minutes across multiple joints. 1

Scoring System

The MMAS uses a 0-4 grading scale to assess resistance during passive muscle stretch:

  • 0 = No increase in muscle tone
  • 1 = Slight increase in tone with a catch and release or minimal resistance at end range
  • 1+ = Slight increase in tone with a catch followed by minimal resistance through less than half of the range of motion
  • 2 = More marked increase in tone through most of the range of motion, but affected part easily moved
  • 3 = Considerable increase in tone, passive movement difficult
  • 4 = Affected part rigid in flexion or extension

The scale measures velocity-dependent resistance to passive stretch, which is the hallmark of spasticity 1.

Clinical Application

Assessment Technique

  • The examiner moves the limb through its range of motion at a standardized velocity
  • Can be applied to any joint or focused on specific muscle groups
  • Most commonly assessed sites include:
    • Upper extremity: elbow flexors, wrist flexors, finger flexors
    • Lower extremity: hip adductors, knee extensors/flexors, ankle plantar flexors

Administration Time

Takes approximately 10 minutes to complete when assessing multiple joints 1.

Reliability and Validity

The MMAS demonstrates very good psychometric properties:

Intrarater Reliability

  • Very good overall agreement (weighted kappa = 0.87) 2
  • Ankle plantar flexors show the highest reliability (weighted kappa = 0.85)
  • Hip adductors show moderate reliability (weighted kappa = 0.45)
  • Knee extensors show good reliability (weighted kappa = 0.62) 2

Interrater Reliability

  • Very good for wrist flexors (weighted kappa = 0.92) 3
  • Good to very good for lower extremity: hip adductors and knee extensors (weighted kappa = 0.82), ankle plantar flexors (weighted kappa = 0.74) 4
  • Good for upper extremity: elbow flexors (weighted kappa = 0.61), wrist flexors (weighted kappa = 0.78) 5

Validity

The MMAS shows significant positive correlation with neurophysiological measures of spasticity (H-reflex parameters), supporting its validity as a measure of true spasticity (r = 0.39, p = 0.04) 6.

Responsiveness

The scale demonstrates marked responsiveness in detecting changes over time in stroke patients (standardized response mean = 0.89-1.09) 7.

Clinical Significance

Minimal Clinically Important Difference (MCID)

  • Upper extremity muscles: 0.48-0.76 points (depending on effect size threshold)
  • Lower extremity muscles: 0.45-0.73 points 7

These values help clinicians determine whether observed changes represent true, clinically meaningful improvements rather than measurement error.

Common Pitfalls

Reliability varies by joint assessed: The ankle plantar flexors consistently show the highest reliability, while hip adductors show the lowest. When tracking spasticity over time, focus on more reliable joints for the most accurate assessment 2.

Velocity-dependent assessment is critical: The examiner must move the limb at a consistent, standardized velocity. Slow movements may underestimate spasticity, while rapid movements may overestimate it.

Distinguish from other forms of hypertonia: The MMAS specifically measures velocity-dependent resistance (spasticity), not rigidity or dystonia, which may also be present post-stroke 8, 1.

Role in Treatment Planning

The MMAS serves as a key outcome measure when considering interventions for spasticity 8, 1:

  • Guides decisions about botulinum toxin injections for focal spasticity
  • Helps monitor response to oral antispasticity agents
  • Tracks effectiveness of physical modalities (electrical stimulation, vibration)
  • Informs need for escalation to intrathecal baclofen in refractory cases

The scale's strong reliability and established MCID values make it an essential tool for both clinical decision-making and monitoring treatment response in patients with post-stroke spasticity.

References

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