Reliability and Validity of the Modified Heckmatt Scale in Evaluating Muscle Changes With Ultrasound in Spasticity.
Marisa C Moreta, Alana Fleet, Rajiv Reebye and 4 others
PMID 33543098WHAT IT FOUND
The Modified Heckmatt scale reliably grades muscle fibrosis on ultrasound in patients with spasticity.
Agreement was good for both experts and residents, and scores matched quantitative analysis closely. This makes it a practical bedside tool for assessing muscle quality before botulinum toxin injections.
Key findings
01The scale showed good overall agreement between raters (ICC 0.76) and within the same raters over time (ICC 0.81).
02Visual grading correlated strongly with computerized gray-scale analysis (r=0.829), supporting its validity.
03Agreement was highest for normal (grade 1) and severely fibrosed (grade 4) muscles, and lower for intermediate grades (2 and 3).
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study did not compare the Modified Heckmatt scale directly against the original Heckmatt scale, so improvements over the original are inferred rather than proven. Linear array transducers have limited depth penetration (approx. 6 cm), making it difficult to assess deeper muscles or patients with severe obesity. Obtaining a clear bone window for comparison was sometimes difficult during scanning. The study measured reliability and validity of the assessment tool, not clinical outcomes or the effectiveness of treatments guided by it.
Declared interests
The authors declared no conflicts of interest. The study used commercial ultrasound equipment (Sonosite) and software (ImageJ, REDCap, IBM SPSS), but the funding source and specific role of vendors in the study design or analysis were not detailed in the provided text.
The easy way to misread this
Do not assume that using this scale to guide treatment will improve patient outcomes. The study proves the scale is reliable for grading muscle fibrosis, but it did not test whether this grading changes clinical decisions or leads to better results after botulinum toxin injections.