No abstract available.
Animals ; Lordosis*

No abstract available.
Animals ; Lordosis*

No abstract available.
Animals ; Humans ; Lordosis*

No abstract available.
Animals ; Back Pain* ; Lordosis*

No abstract available.
Animals ; Lordosis* ; Spine*

STUDY DESIGN: Literature review. OBJECTIVES: To present updated information on the relationship of the pelvis and lumbar degenerative disease (LDD) patients and to emphasize the importance of the pelvis in sagittal alignment of LDD patients. SUMMARY OF LITERATURE REVIEW: Although the relationship of the pelvis and sagittal alignment of LDD patients is controversial, many authors have reported a significant impact of the pelvis on LDD sagittal alignment. MATERIALS AND METHODS: The authors identified references through a literature search on the pelvis and LDD and continuous monitoring of the literature during the past 30 years. RESULTS: The pelvis and lumbar levels were related to whole-body sagittal alignment. The pelvis is also closely related to sagittal alignment of LDD patients. Therefore, the entire area should be regarded as a lumbopelvic complex. CONCLUSIONS: We need to consider the concept of a lumbopelvic joint and lumbopelvic lordosis, not a lumbosacral joint and lumbar lordosis. We must also evaluate the lumbopelvic complex to assess whole-body sagittal alignment and dynamic balance.
Animals ; Humans ; Joints ; Lordosis ; Pelvis*

The low lumbar spine is deeply located in flexible segments, and has a physiologic lordosis. Therefore, burst fractures of the low lumbar spine are uncommon injuries. The treatment for such injuries may either be conservative or surgical management according to canal compromise and the neurological status. However, there are no general guidelines or consensus for the treatment of low lumbar burst fractures especially in neurologically intact cases with severe canal compromise. We report a patient with a burst fracture of the fourth lumbar vertebra, who was treated surgically but without fusion because of the neurologically intact status in spite of severe canal compromise of more than 85%. It was possible to preserve motion segments by removal of screws at one year later. We also discuss why bone fusion was not necessary with review of the relevant literature.
Animals ; Consensus ; Humans ; Lordosis ; Spine

STUDY DESIGN: Retrospective study. PURPOSE: To compare initial fixation using the cortical bone trajectory (CBT) technique versus conventional pedicle screws (PS) in radiographs of postsurgical lumbar degenerative spondylolisthesis. OVERVIEW OF LITERATURE: Few reports have documented the holding strength of CBT technique for spondylolisthesis cases. METHODS: From October 2009 to June 2014, 21 cases of degenerative spondylolisthesis were surgically treated in our institution. Ten were treated with conventional PS technique and 11 of with CBT technique. Mean lumbar lordosis and percent slippage were evaluated preoperatively, immediately after surgery, and 6 months and 1 year postoperatively using radiographs. We also investigated percent loss of slip reduction. RESULTS: There were statistically significant differences between preoperative percent slippage and postoperative slippage in both PS and CBT procedures over 1 year, and both techniques showed good slip reduction. On the other hand, lumbar lordosis did not change significantly in either the PS or CBT groups over 1 year. CONCLUSIONS: CBT technique showed similarly good initial fixation compared with the PS procedure in the treatment of lumbar degenerative spondylolisthesis.
Animals ; Hand ; Lordosis ; Retrospective Studies ; Spondylolisthesis*

STUDY DESIGN: A study was designed to compare lumbar lordosis in different positions. OBJECTIVES: The aim of this study was to document the changes of segmental and total lumbar lordosis in common operative positions of lumbar spine. SUMMARY OF LITERATURE REVIEW: It is very important to maintain physiologic lumbar lordosis in instrumentation of lumbar spine. MATERIALS AND METHODS: Twenty-six asymptomatic volunteers underwent a series of four lateral lumbar radiographs ; standing, prone on chest roll and prone on Wilson spine table with hip flexion of 60 and 20 degree. Lumbar lordosis and segmental lordotic angle were compared and analyzed regarding to positions. Lordosis in stading position was assumed to be physiologic. RESULTS: In chest roll position, physiologic lordosis was preserved, but segmental lordotic angles of L3-L4 and L4-L5 significantly decreased compared with those in standing position. Total lumbar lordosis in the Wilson table with hip flexion of 60 degree and 20 degree was decreased 42% and 22%, respectively. In Wilson table, segmental lordotic angles of L1-L2, L2-L3, L3-L4 and L4-L5 were significantly decreased compared with those in standing position. CONCLUSIONS: Physiologic lordosis was preserved only under chest roll. Segmental lordotic angles of L5-S1 was not influenced by positions.
Animals ; Hip ; Lordosis* ; Spine ; Thorax ; Volunteers

STUDY DESIGN: A Retrospective study OBJECTIVES: To analyze the causes of revision arthrodesis for the degenerative changes at the adjacent segment after lumbosacral fusion for degenerative lumbar diseases. SUMMARY OF LITERATURE REVIEW: Revision arthrodesis is quite common. However, there is some controversy regarding the causes and risk factors. MATERIALS AND METHODS: Twenty cases who had undergone revision arthrodesis after lumbosacral fusion were examined. Preexisting degenerative changes to the adjacent segment, location of the adjacent segment and extent of fusion, as well as changes in lumbar lordosis were observed in primary arthrodesis, and the relationship between the changes in the adjacent segment degeneration were analyzed in terms of the area of residence, activity level and living pattern of the patients. RESULTS: Preexisting degenerative changes in the adjacent segment were observed in 14 cases and degenerative changes developed at the proximal junction in 19. Multiple segment fusion were performed in 13 cases during primary arthrodesis, 9 cases developed degenerative changes at the proximal junction. Fifteen cases with abnormal postoperative lumbar lordosis demonstrated adjacent segment degeneration. Sixteen cases living in the countryside and 15 cases with a history of severe physical labor after the primary operation showed degenerative changes in the adjacent segment before secondary arthrodesis. CONCLUSION: The causes of revision arthrodesis for the degenerative changes at the adjacent segment are believed to be preexisting degenerative changes in the adjacent segment at the proximal junction, loss of lordosis after primary fusion, and severe physical labor from living in the countryside
Animals ; Arthrodesis ; Humans ; Lordosis ; Retrospective Studies