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目的：探讨寰椎后弓椎动脉沟环（下称后环）对颈性眩晕的关系．材料方法：从1000例颈椎摄片中，选出有后环的92例。体征通过转动头颈诱发椎动脉屈曲试验阳性，58例作脑血管多普勒（TCD）检查评估基底动脉供血情况，全部病例在电视下摄取颈椎正侧及双斜位片，分析后环的形态、大小及出现位置．结果：（1）完整环／孔46例。呈椭圆形者39例，近似圆形者7例，双侧着7例，左侧者19例，右侧着20例，不完整环46例。有3种X线变异型：上突骨、下突骨与吻状突骨．有颈椎退变者34例；无颈椎退变者58例．（2）后环与颈性眩晕无颈椎退变X线征象的58例（63％），TCD均提示基底动脉痉挛或供血不足，其中5例还出现单侧或双侧大脑中动脉血流下降，另8例经转头后才显示基底动脉供血不足。（3）临床主要以椎动脉型颈性眩晕者38例，颈一脑－臂综合症者54例．结论：后环的存在，对头颈的轴向旋转运动，可引起椎动脉V－3段痉挛与狭窄．导致脑底供血不足出现间歇性眩晕有密切关系。
Objective: To investigate the relationship between atlas posterior arch vertebral artery ditch ring (hereinafter referred to as posterior ring) and cervical dizziness. Materials and methods: From 1000 cases of cervical spine, selected after the ring of 92 cases. Vertebral artery buckling test was induced by turning the head and neck, 58 cases of cerebrovascular Doppler (TCD) assessment of basilar artery blood supply, all patients under the TV intake of the cervical spine and double oblique film, the analysis of the ring morphology, Size and appearance. Results: (1) complete ring / hole in 46 cases. 39 cases were oval, approximately 7 cases of circular, bilateral in 7 cases, 19 cases on the left side, right side of the 20 cases, incomplete ring 46 cases. There are three kinds of X-ray variants: on the bone, under the bone and kiss sudden bone. 34 cases of cervical degeneration; no cervical degeneration in 58 cases. (2) Fifty-eight cases (63%) of X-ray findings of posterior and cervical vertigo without cervical vertebrae degeneration, TCD showed basilar artery spasm or insufficient blood supply, of which 5 cases also appeared unilateral or bilateral middle cerebral artery blood flow decreased , And the other 8 cases showed the insufficiency of basilar artery after the first time. (3) 38 cases of vertebral artery type cervical vertigo, 54 cases of cervical-brain-arm syndrome. Conclusion: The existence of posterior ring, axial rotation of the head and neck movement, can cause V-3 spasm and stenosis of the vertebral artery. It is closely related to the intermittent dizziness caused by insufficient blood supply to the brain.