Fig. 2From: An evaluation of the efficacy of a four-grade fat infiltration classification method, presented for the first time in literatureT2 axial magnetic resonance imaging slices showing location of the muscles and degree of fat infiltration, evaluated with the 4-grade system. A Grade 1:ā<ā10% fat infiltration, B Grade 2: 10%- 30% fat infiltration, C Grade 3: 30%-50% fat infiltration, D Grade 4:ā>ā50% fat infiltration, Musculus multifidus (MF), Musculus erector spinae (ES)Back to article page