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作者报告2例Down氏综合征儿童有颈部失稳伴明显的寰枕部半脱位。例1为17岁男孩,因偶然颈痛摄片,伸展位枕骨与C_1位置正常,但屈曲位时枕骨沿C_1相对扁的关节面向前水平移动1.2cm,颈椎电视透视显示在伸展时枕骨在C_1上明显后移。例2为6岁女孩,体育训练前做颈椎X线检查,颈椎伸、屈侧位片及电视透视均示枕骨在C_1之上明显水平移动1.5cm。伸展位时寰枕关节向后半脱位,颅底(与齿突关系)呈异常后位;屈曲位示枕骨在C_1上向前运动1.5cm。作者指出,从胚胎学、生物力
The authors report two cases of Down’s syndrome in children with cervical instability with significant atlanto-occipital subluxation. Case 1 was a 17-year-old boy who had a normal occipital axis and a normal C_1 position due to occasional neck pain. However, the occipital bone moved forward 1.2 cm along the relatively flat articular surface of C_1 at flexion. Cervical fluoroscopy revealed that the occipital bone was enlarged at C_1 On the obvious shift. Case 2 was a 6-year-old girl who underwent cervical X-ray examination before sports training. The cervical spine extension, flexion and radiographs showed that the occiput was obviously moved 1.5 cm horizontally above C_1. The extensor posterior submandibular joint subluxation, skull base (with the relationship between the odontoid anomalous posterior position; flexion showed occipital forward C 1.5cm. The authors note that from embryology, biomechanics