Reliability and Validity of the Modified Heckmatt Scale in Evaluating Muscle Changes With Ultrasound in Spasticity

Objectives To determine the reliability and validity of the Modified Heckmatt scale in assessing muscle echotexture in spasticity. Design Prospective, observational, 2-center study. Two residents and 2 ultrasound experienced staff physicians each rated 100 ultrasound images that were also analyzed using quantitative gray-scale. Setting Academic ambulatory spasticity clinic. Participants Participants (N=50) included 45 patients with upper or lower extremity spasticity and 5 healthy references. Interventions Not applicable. Main Outcome Measures Modified Heckmatt scale ratings and quantitative gray-scale scores Results Inter- and intra-rater intraclass correlation coefficients were 0.76 and 0.81, respectively (P<.001), indicating good to excellent reliability. A significant relationship was found between Modified Heckmatt scores and quantitative gray-scale scores (r=0.829; P<.001). Conclusions The Modified Heckmatt scale demonstrated good reliability and validity to assess the pathologic muscle changes that occur in patients with spasticity.