OBJECTIVE: To investigate the mechanism associated with thoracolumbar burst fractures. METHODS: Stress distribution of the spine in the upright, flexion and extension positions was analyzed using a three-dimensional f...OBJECTIVE: To investigate the mechanism associated with thoracolumbar burst fractures. METHODS: Stress distribution of the spine in the upright, flexion and extension positions was analyzed using a three-dimensional finite element model of the spinal motion segment. RESULTS: Stress concentration was noted at the pedicle and posterosuperior part of the vertebral body near the pedicle. CONCLUSION: Stress concentration of the spine may be implicated in the biomechanical mechanism underlying thoracolumbar burst fractures.展开更多
Objective ：To choose a proper method of lumbar transpedicular screw fixation at different lumbar levels among the three methods （ Roy-Camille＇s method, Magerl＇s method and Du＇s method） in the Chinese population....Objective ：To choose a proper method of lumbar transpedicular screw fixation at different lumbar levels among the three methods （ Roy-Camille＇s method, Magerl＇s method and Du＇s method） in the Chinese population. Methods ： Three-dimensional （ 3-D ） images were reconstructed with image data of 42 adult lumbar segments that were scanned by Electron Beam CT. The three methods of lumbar pedicle screw fixation were simulated on the 3-D reconstructed images and the parameters of implanting pedicle screws were measured. Results： There was statistically significant difference at the distance from the entrance point to the pedicle axis between the three methods （P 〈 0.001 ）. The distances measured by Du＇s method were shortest from L1 to L4, and the distances measured by Magerl＇s method were shortest at L5 （P 〈0.05）. There was no significant difference from L1 to L2 （P 〉0.05） but significant difference from L3 to L5 at inserting safe ranges of TSA （transverse section angle ） was found between the three methods （P 〈0.05）. From L3 to L4, the inserting safe ranges of TSA measured by Du＇s and Magerrs methods were significantly larger than that measured by Roy- Camille＇s method （P 〈0.05）, but there was no significant difference between them （ P 〉 0.05）. At L5, the inserting safe ranges of TSA measured by Magerrs method were largest among the three methods （ P 〈 0.05 ）. Conclusions： Among the three methods, Du＇s method is the best choice from L1 to L4 because its distance from the entrance point to the pedicle axis is shortest and the safe range of TSA is largest; Magerl＇s method can be used from L3 to L5 and is the best choice at L5; Roy- Camille＇s method is applicable at L1 and L2.展开更多
Since the late 20th century owing to the improvement of spinal surgery techniques, the diagnosis and treatment of thoracolumbar fracture have been perfected more and more. Although the advent of modern spinal surgery ...Since the late 20th century owing to the improvement of spinal surgery techniques, the diagnosis and treatment of thoracolumbar fracture have been perfected more and more. Although the advent of modern spinal surgery in China was late, we have gained some advanced achievements owing to various international communications benefited from the open policy. Therefore, it is essential to evaluate the current status and perspective of diagnosis and treatment of thoracolumbar fracture. There are several issues we would like to discuss here.展开更多
基金supported by the National Natural Science Foundation of China(No3880785)
文摘OBJECTIVE: To investigate the mechanism associated with thoracolumbar burst fractures. METHODS: Stress distribution of the spine in the upright, flexion and extension positions was analyzed using a three-dimensional finite element model of the spinal motion segment. RESULTS: Stress concentration was noted at the pedicle and posterosuperior part of the vertebral body near the pedicle. CONCLUSION: Stress concentration of the spine may be implicated in the biomechanical mechanism underlying thoracolumbar burst fractures.
文摘Objective ：To choose a proper method of lumbar transpedicular screw fixation at different lumbar levels among the three methods （ Roy-Camille＇s method, Magerl＇s method and Du＇s method） in the Chinese population. Methods ： Three-dimensional （ 3-D ） images were reconstructed with image data of 42 adult lumbar segments that were scanned by Electron Beam CT. The three methods of lumbar pedicle screw fixation were simulated on the 3-D reconstructed images and the parameters of implanting pedicle screws were measured. Results： There was statistically significant difference at the distance from the entrance point to the pedicle axis between the three methods （P 〈 0.001 ）. The distances measured by Du＇s method were shortest from L1 to L4, and the distances measured by Magerl＇s method were shortest at L5 （P 〈0.05）. There was no significant difference from L1 to L2 （P 〉0.05） but significant difference from L3 to L5 at inserting safe ranges of TSA （transverse section angle ） was found between the three methods （P 〈0.05）. From L3 to L4, the inserting safe ranges of TSA measured by Du＇s and Magerrs methods were significantly larger than that measured by Roy- Camille＇s method （P 〈0.05）, but there was no significant difference between them （ P 〉 0.05）. At L5, the inserting safe ranges of TSA measured by Magerrs method were largest among the three methods （ P 〈 0.05 ）. Conclusions： Among the three methods, Du＇s method is the best choice from L1 to L4 because its distance from the entrance point to the pedicle axis is shortest and the safe range of TSA is largest; Magerl＇s method can be used from L3 to L5 and is the best choice at L5; Roy- Camille＇s method is applicable at L1 and L2.
文摘Since the late 20th century owing to the improvement of spinal surgery techniques, the diagnosis and treatment of thoracolumbar fracture have been perfected more and more. Although the advent of modern spinal surgery in China was late, we have gained some advanced achievements owing to various international communications benefited from the open policy. Therefore, it is essential to evaluate the current status and perspective of diagnosis and treatment of thoracolumbar fracture. There are several issues we would like to discuss here.
