title: Cervical spinal motion before and after surgery in patients with Chiari malformation type I associated with syringomyelia.
abstract: OBJECTIVE
  There have been few reports about the cervical spinal motion in patients with Chiari malformation Type I (CM-I) associated with syringomyelia. To investigate this phenomenon, the relationship between the preoperative cervical range of motion (ROM) and the stage of cerebellar tonsillar descent as well as the cervical ROM before and after foramen magnum decompression (FMD) were evaluated.
  
  
  METHODS
  Thirty patients who had CM-I associated with syringomyelia and who underwent FMD participated in the study. The ROM and lordosis angle of the cervical spine were measured on x-ray films. In addition, the relationship between preoperative degree of cerebellar tonsillar descent and the ROM between the levels of the occiput (Oc) and C2 was investigated.
  
  
  RESULTS
  The mean flexion-extension ROM at Oc-C2 was 15.5 degrees before and 14.1 degrees after surgery, and the mean flexion-extension ROM of C2-7 was 55.1 degrees before and 52.8 degrees after surgery. The mean pre- and postoperative lordosis angles at C2-7 were 16.8 and 19.1 degrees, respectively. There was no significant difference between the values measured before and after surgery. There was no correlation between the degree of cerebellar tonsillar descent and the ROM at Oc-C2. CONCLUSIONS. Foramen magnum decompression is an excellent surgical technique that has no effect on the postoperative cervical ROM and cervical alignment.
authors.affiliation: Department of Orthopaedic Surgery, Hirosaki University School of Medicine, Japan. atsu-ono@cc.hirosaki-u.ac.jp
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ono
authors.forename: Futoshi
authors.initials: F
authors.lastname: Suetsuna
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Ueyama
authors.forename: Toru
authors.initials: T
authors.lastname: Yokoyama
authors.forename: Shuichi
authors.initials: S
authors.lastname: Aburakawa
authors.forename: Kazunari
authors.initials: K
authors.lastname: Takeuchi
authors.forename: Takuya
authors.initials: T
authors.lastname: Numasawa
authors.forename: Kanichiro
authors.initials: K
authors.lastname: Wada
authors.forename: Satoshi
authors.initials: S
authors.lastname: Toh
mesh_terms: D000328:Adult; D000368:Aged; D001139:Arnold-Chiari Malformation / Q000150:complications / Q000503:physiopathology* / Q000601:surgery*; D001268:Atlanto-Axial Joint / Q000503:physiopathology*; D001269:Atlanto-Occipital Joint / Q000503:physiopathology*; D019299:Decompression, Surgical; D005260:Female; D005500:Follow-Up Studies; D005539:Foramen Magnum / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular / Q000502:physiology*; D013595:Syringomyelia / Q000150:complications / Q000503:physiopathology* / Q000601:surgery; D016896:Treatment Outcome