title: Long-term results of double-door laminoplasty using hydroxyapatite spacers in patients with compressive cervical myelopathy.
abstract: No previous studies have reported 10-year follow-up results for double-door laminoplasty using hydroxyapatite (HA) spacers. The purpose of this study was therefore to explore the long-term results of double-door laminoplasty using HA spacers and to determine if non-union or breakage of HA spacers is related to restenosis of the enlarged cervical canal. The study group consisted of 68 patients with a minimum of 10 years of follow-up after double-door laminoplasty using HA spacers. The average postoperative Japanese Orthopaedic Association score improved significantly after surgery and was maintained until the final follow-up. The average range of motion decreased by 42.6% in patients with cervical spondylotic myelopathy (CSM) and 65.8% in patients with ossification of the posterior longitudinal ligament (OPLL). The enlarged cervical canal area was preserved almost until the final follow-up. The average non-union rates of HA spacers were 21% in CSM and 17% in OPLL, and the average breakage rates were 24 in CSM and 21% in OPLL at the final follow-up. Although non-union and breakage of HA spacers were common, neither of these factors were correlated with restenosis of the enlarged cervical canal.
authors.affiliation: Department of Orthopaedics, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi 329-0498, Japan. akimura@jichi.ac.jp
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kimura
authors.forename: Atsushi
authors.initials: A
authors.lastname: Seichi
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Inoue
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Hoshino
mesh_terms: D000328:Adult; D000368:Aged; D002574:Cervical Vertebrae / Q000601:surgery*; D017886:Durapatite; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007796:Laminectomy / Q000379:methods*; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D013117:Spinal Cord Compression / Q000601:surgery*; D013130:Spinal Stenosis / Q000601:surgery*; D016896:Treatment Outcome
chemical_list: D017886:Durapatite