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用15具尸体的头颈部,锯成正中矢状断面,观测了寰椎平面椎管与椎管内容间的关系。可见两种情况,一种为蛛网膜下腔宽大型,约占1/3,矢状径在17mm 以上;另一种为窄小型,约占2/3,矢状经在16mm 以下。在模拟齿突骨折伴寰椎向前脱位时,宽大型者,首先在前方的枢椎体后上缘构成对脊髓前面的压迫,移位加剧,寰椎后弓对脊髓后面也构成压迫。窄小型因蛛网膜下腔窄小,缓冲余地小,轻微的移位即可同时对脊髓前、后面构成压迫。故认为,在齿突骨折、寰枢椎脱位伴有神经症状时,后方入路单纯切除寰椎后弓减压,只能解除后方的压迫;若采用前方入路切除环椎前弓及折断的齿突,然后复位,可解决来自前后双方的压迫。
With 15 corpses of the head and neck, sawing into the median sagittal section, observing the atlas plane spinal canal and the relationship between the contents of the spinal canal. Visible in two cases, one for the wide subarachnoid space, accounting for about 1/3, sagittal diameter of more than 17mm; the other is narrow, about 2/3, sagittal in 16mm below. In the simulation of odontoid fracture with atlantoaxial anterior dislocation, the vast majority, the first in the front of the vertebral body after the formation of the upper edge of the spinal cord in front of the oppression, displacement increased, posterior arch of the atlas also poses a pressure on the back of the spinal cord. Narrow small due to narrow subarachnoid space, the room for a small buffer, a slight shift at the same time on the spinal cord before and after the formation of oppression. Therefore, in the odontoid fracture, atlantoaxial dislocation with neurological symptoms, the posterior approach simply resection of the atlas arch decompression, can only relieve the rear oppression; if the anterior approach to the anterior arch and the ring off Teeth, and then reset, to solve the oppression from both sides.