title: Pediatric Patient with Incidental Os Odontoideum Safely Treated with Posterior Fixation Using Rod-Hook System and Preoperative Planning Using 3D Printer: A Case Report.
abstract: Os odontoideum is often found incidentally. Surgical treatment is recommended for patients with atlantoaxial instability or neurologic deficits. Although various techniques have been used for C1-C2 fusion in adults, the use of these procedures in children is not widely accepted. We present a 12-year-old boy with incidental os odontoideum and obvious C1-C2 instability, in which bony union was achieved safely and successfully by posterior fixation using a rod-hook system and perioperative planning using a three-dimensional printer. At the 2-year follow-up, bone formation around the gap of the dens, which has been generally considered as pseudoarthrosis, was obtained after union of the posterior element of C1-C2.
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Toshinori
authors.initials: T
authors.lastname: Sakai
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Fumitake
authors.initials: F
authors.lastname: Tezuka
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Mitsunobu
authors.initials: M
authors.lastname: Abe
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Kazuta
authors.initials: K
authors.lastname: Yamashita
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Takata
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Kosaku
authors.initials: K
authors.lastname: Higashino
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Nagamachi
authors.affiliation: Department of Orthopedics, Tokushima University Graduate School, Tokushima, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Sairyo
mesh_terms: D002648:Child; D006801:Humans; D033162:Incidental Findings; D008297:Male; D009809:Odontoid Process / Q000601:surgery*; D066330:Printing, Three-Dimensional; D013122:Spinal Diseases / Q000601:surgery*; D013123:Spinal Fusion / Q000295:instrumentation*