Ryken T, Menezes A H
University of Iowa Hospitals and Clinics, Division of Neurosurgery, Iowa City.
Spine (Phila Pa 1976). 1993 Dec;18(16):2525-7. doi: 10.1097/00007632-199312000-00025.
Cranial settling is a condition in which erosive changes of the atlantal lateral masses result in downward telescoping of the atlas onto the axis body, anterior displacement of the atlantal posterior arch, and subsequent ventral and dorsal cervicomedullary compression. Cranial settling is described in conjunction with rheumatoid basilar invagination and atlanto-axial instability, possibly representing the most life-threatening abnormality associated with rheumatoid arthritis. The authors describe a case of symptomatic cranial settling in a nonrheumatoid patient with chronic, severe, spasmodic torticollis resulting in erosive changes in the occipito-atlanto-axial complex.
颅骨下沉是一种寰椎侧块出现侵蚀性改变，导致寰椎向枢椎体向下套叠、寰椎后弓向前移位，继而引起颈髓腹侧和背侧受压的病症。颅骨下沉常与类风湿性基底凹陷及寰枢椎不稳相关，可能是类风湿性关节炎最危及生命的异常表现。作者描述了一例非类风湿性患者出现症状性颅骨下沉的病例，该患者患有慢性、严重的痉挛性斜颈，导致枕寰枢复合体出现侵蚀性改变。
