title: Stand-alone Cervical Cages Versus Anterior Cervical Plates in 2-Level Cervical Anterior Interbody Fusion Patients: Analysis of Adjacent Segment Degeneration.
abstract: METHODS
  A retrospective study.
  
  
  OBJECTIVE
  To analyze adjacent segment degeneration (ASD) in 2-level anterior cervical discectomy, comparing fusion with stand-alone cages [anterior cervical discectomy and fusion (ACDF)-CA] and fusion with cage and plate constructs (ACDF-CPC) with respect to clinical outcomes and radiologic changes.
  
  
  BACKGROUND
  ACDF using a stand-alone cage or a cage and plate construct is a popular procedure. However, there is lack of knowledge concerning ASD between the 2 procedures.
  
  
  METHODS
  A total of 42 consecutive patients who underwent 2-level ACDF-CA or ACDF-CPC for 2-level cervical disk disease and who completed 2 years of follow-up were included in this study. The patients were divided into 2 groups: ACDF-CA group (n=22) and ACDF-CPC group (n=20). The following parameters were assessed using radiographs: disk space narrowing, anterior osteophyte formation, calcification of the anterior longitudinal ligament, and fusion status. Clinical outcomes were assessed using the Robinson criteria.
  
  
  RESULTS
  No difference in clinical outcomes was observed between the 2 groups. Moreover, the ACDF-CPC group showed a similar fusion rate compared with the ACDF-CA group (100% vs. 95%, P=0.335). There was also no statistical significance in anterior osteophyte formation and calcification of the anterior longitudinal ligament. However, mean intervertebral disk height change of an adjacent segment was significantly lower in the ACDF-CA group than the ACDF-CPC group (upper level: 0.08±0.24 vs. 0.49±0.35; lower level: 0.06±0.41 vs. 0.49±0.28; P<0.01).
  
  
  CONCLUSIONS
  The use of a cage with or without plate constructs in 2-level ACDF provides similar clinical results and fusion rates. Notwithstanding, ACDF-CPC showed a higher incidence of ASD than ACDF-CA over the 2-year follow-up.
authors.affiliation: *Department of Neurosurgery †Spine and Joint Research Institute, Guro Teun Teun Hospital ‡Department of Neurosurgery §Spine and Spinal Cord Research Institute, Yonsei University College of Medicine, Seoul, South Korea ∥College of Medicine, Padjadjaran University, Hasan Sadikin Hospital, Bandung, West Java, Indonesia.
authors.forename: Gyu Yeul
authors.initials: GY
authors.lastname: Ji
authors.forename: Chang Hyun
authors.initials: CH
authors.lastname: Oh
authors.forename: Dong Ah
authors.initials: DA
authors.lastname: Shin
authors.forename: Yoon
authors.initials: Y
authors.lastname: Ha
authors.forename: Keung Nyun
authors.initials: KN
authors.lastname: Kim
authors.forename: Do Heum
authors.initials: DH
authors.lastname: Yoon
authors.forename: Farid
authors.initials: F
authors.lastname: Yudoyono
mesh_terms: D000368:Aged; D001860:Bone Plates / Q000009:adverse effects; D002114:Calcinosis / Q000473:pathology; D002574:Cervical Vertebrae / Q000601:surgery; D017586:Diskectomy / Q000379:methods*; D005260:Female; D006801:Humans; D015994:Incidence; D055959:Intervertebral Disc Degeneration / Q000000981:diagnostic imaging / Q000601:surgery; D008022:Ligaments / Q000473:pathology; D008297:Male; D008875:Middle Aged; D019637:Orthopedic Procedures / Q000009:adverse effects / Q000379:methods*; D054850:Osteophyte / Q000473:pathology; D011859:Radiography; D012189:Retrospective Studies; D013123:Spinal Fusion / Q000009:adverse effects / Q000379:methods*; D016896:Treatment Outcome