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为了探讨小儿颈椎前半脱位的X线特点。方法：对1990～1995年收治的14例颈椎前半脱位患儿下颈椎后突节段相邻椎体所成角作了测量。结果：牵引前不稳定椎体间所成角为17．2±4．9°．牵引后此角平均为5．0±2．8°（P＜0.001）。结论：牵引前测定相邻椎体所成角．有助于不稳定椎体的定位诊断；牵引后复测此角．对判断牵引效果及预后评估也有裨益。
In order to explore the pediatric cervical subluxation X-ray features. Methods: The angle formed by the adjacent vertebral bodies in the lower cervical condylar segment of 14 children with anterior cervical dislocation treated from 1990 to 1995 was measured. Results: The angle between unstable vertebral body before traction was 17.2 ± 4.9 °. The average angle after traction was 5.0 ± 2.8 ° (P <0.001). Conclusions: The angles of adjacent vertebrae were measured before traction. Contribute to the diagnosis of unstable vertebral positioning; retest after traction angle. Judgment of traction and prognosis are also helpful.