Fig. 4From: Sex-based differences in clinical and radiological presentation of patients with degenerative lumbar scoliosis: a cross-sectional studySchematic diagram of fatty infiltration rate (FIR) measurement. A Paraspinal muscles (multifidus and erector spinae) at the level of the apical vertebrae (or intervertebral disks) were circled on MRI. B A threshold technique was applied to color pixels of fat tissue within the muscles in redBack to article page