Fig. 1From: Sagittal imbalance syndrome, a new concept, helps determining a long fusion for patients with degenerative lumbar spinal stenosis and severe global sagittal imbalanceSevere back pain in natural position and comfort with a support. When in natural standing or in natural walking without any support, patient could not maintain an upright position and would complain of a severe back pain (VAS > 5 score) (a, b, c, d). Using a walking aid, patient could walk freely and the severe back pain would disappear or significantly relieve (e, f)Back to article page