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Table 3 Criteria for grading muscle fatty degeneration (Goutallier score)

From: Clinical and radiological outcome of conservative vs. surgical treatment of atraumatic degenerative rotator cuff rupture: design of a randomized controlled trial

Grade 0 No fatty deposits
Grade 1 Some fatty streaks
Grade 2 More muscle than fat
Grade 3 As much muscle as fat
Grade 4 Less muscle than fat