Fig. 2
From: Is intrinsic lumbar spine shape associated with lumbar disc degeneration? An exploratory study
The modes of sagittal lumbar variation and percentage variance. Mode 1 represents curviness, Mode 2 evenness, Mode 3 vertebral depth, Mode 4 evenness and reduced intervertebral space (L4-S1), Mode 5 represents changes in sacrum morphology, Mode 6 describes variations in vertebral shape and intervertebral spaces (L4-S1) and Mode 7 reduced intervertebral spaces (L4-S1). Blue corresponds with + 2 standard deviations (+2SD) and red with − 2 standard deviations (− 2SD))