Fig. 2From: Fat infiltration of paraspinal muscles as an independent risk for bone nonunion after posterior lumbar interbody fusiona Measurements of paraspinal muscular parameters on axial T2-weighted MRI (a 62-year-old woman). Regions of multifidus (1), erector spinae (2) and psoas muscle (3) at L4 level were outlined by yellow lines. For psoas muscle, only functional muscle was outlined. b Thresholding technique to highlight fatty area (red area)Back to article page