Hello Professionally Integrated, Here is a cool study that shows how spinal shape and movement can change a Chiari. On this site I posted a paper about MVC causing Chiari  https://professionallyintegrated.com/diagnosis/instability/chiari-caused-from-wad/ Here is a bit at what the authors mention "Although minimal, we found that in many patients with a Chiari I malformation, the cerebellar…