Fig. 1From: Methodological considerations in region of interest definitions for paraspinal muscles in axial MRIs of the lumbar spineT2 weighted axial MR images of the lumbar spine. Images represent Kjaer grade [16] 0 (left), 1 (center), and 2 (right) muscles of the lumbar spine. All images are from patients undergoing surgery for low back pain related pathologyBack to article page