Over Lordosis of the Lumbar Spine Secondary to Kyphosis of Thoracolumbar Spine and Its Clinical Significance

Objective: To investigate the changes of the lumbar spine and its clinical significance secondary to the kyphosis of thoracolumbar spine.Methods:The lateral X-ray films of the lumbar and thoracolumbar spine were studied by measuring in the normal group,invalid group.And then the results were compared statistically between each groups.Results:The average of Cobb's angle of the lumbar spine in invalid group were larger than that in normal group ( p0.001), however it was found that the amount of increased lordosis in the higher part (L_ 2～3 , L_ 3～4 )of the lumbar spine was more than that in the lower part of the lumbar spine (L_ 4～5 and L_5～S_1).The Cobb's angle of segmental lordosis of L_ 2～3 and L_ 3～4 were increased 4.2 times and 2.4 times of that of the correspondent level of the normal spine respectively.Conclusions:Over lordosis of the lumbar spine are main changes secondary to the kyphosis of the thoracolumbar spine.These changes usually maintaine the balance of the whole spine in most conditions,whereas at the same time make great influences on the lumbar spine especially in its high part.