Atlantoaxial Fixation for Basilar Invagination without Obvious Atlantoaxial Instability (Group B Basilar Invagination): Outcome Analysis of 63 Surgically Treated Cases

Letter to the Editor. Chiari formation

“…More importantly, all these secondary musculoskeletal and neural abnormalities are reversible following atlantoaxial fixation. 8,9,11 In response to our article in 2015, 2 a number of pediatric neurosurgeons based in North America argued that our concept is valid more for adult cases with Chiari I formation and in those patients in whom there are complex craniovertebral junction bone malformations. 1 We have subsequently published our results of surgical treatment of Chiari I formation by atlantoaxial fixation in pediatric age-group patients 5 and in cases with Chiari I formation wherein there is no bone deformity.…”

Beyond radiological imaging: Direct observation and manual physical evaluation of spinal instability

“…The treatment of Chiari malformation, syringomyelia, basilar invagination, cervical spondylosis, ossified posterior longitudinal ligament, and several such issues can be radically and rationally altered on the basis of evaluation of their relationship with instability of atlantoaxial joint. [1415161718192021] The fact that atlantoaxial dislocation can be diagnosed on the basis of clinical parameters and direct observations during manual manipulations of the bones of the atlantoaxial region has expanded the scope of treatment of craniovertebral junction instability.…”

Chiari Formation: Atlantoaxial Instability is the Cause

“…We identified that in cases with Chiari formation there is excessive cerebrospinal fluid (CSF) content within the spinal cord (syringomyelia) or outside the spinal cord (external syringomyelia) [13][14][15]. Similarly, there is excessive or more than normal amount of CSF within the brainstem (syringobulbia) or around the brainstem (external syringobulbia).…”