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Heckmatt Scale: visual grading scale to classify muscle echo intensity (Ref 17)
| Grade | Ultrasound appearance |
|---|---|
| Grade 1 | Normal |
| Grade 2 | Increased muscle echo intensity with distinct bone echo |
| Grade 3 | Marked increased muscle echo intensity with a reduced bone echo |
| Grade 4 | Very strong muscle echo and complete loss of bone echo |
