title: Comparison between Radiological and Clinical Outcomes of Laminoplasties with Titanium Miniplates for Cervical Myelopathy.
abstract: BACKGROUND
  Laminoplasty is a surgical procedure frequently performed for cervical myelopathy. We investigated correlations between changes in the anteroposterior diameter (APD) of the spinal canal, spinal canal area (SCA), and laminar angle (LA) and clinical outcomes of laminoplasty.
  
  
  METHODS
  Of the 204 cervical myelopathy patients who underwent laminoplasty from July 2010 to May 2015, 49 patients who were evaluated with pre- and postoperative computed tomography of the cervical vertebrae were included. The average age of the patients was 60.4 years (range, 31 to 82 years), and the average duration of follow-up was 31.6 months (range, 9 to 68 months). Changes in the APD and SCA were measured at the middle of the vertebral body. Changes in LA were measured where both pedicles were clearly visible. Clinical outcomes were assessed using the Japanese Orthopaedic Association (JOA) score and visual analog scale score for pain preoperatively (1 day before surgery) and postoperatively (last outpatient visit) and examining postoperative complications.
  
  
  RESULTS
  The APD showed an average of 54.7% increase from 11.5 to 17.8 mm. The SCA showed an average of 57.7% increase from 225.9 to 356.3 mm2. The LA increased from 34.2° preoperatively to 71.9° postoperatively. The JOA score increased from an average of 9.1 preoperatively to 13.4 postoperatively. Three patients were found to have hinge fractures during surgery. Postoperative complications, including two cases of C5 palsy, were recorded. The correlation coefficient between the LA change and JOA score improvement was -0.449 (p< 0.05). Patients with a < 33° (25%) increase in the LA showed the most significant clinical improvement.
  
  
  CONCLUSIONS
  Patients with a < 33° (25%) change in the LA after laminoplasty with a titanium miniplate showed the most significant clinical improvement. Thus, LA changes can be useful in predicting the clinical outcome of laminoplasty.
authors.affiliation: Department of Orthopedic Surgery, Chungnam National University School of Medicine, Daejeon, Korea.
authors.forename: Jong-Hwa
authors.initials: JH
authors.lastname: Park
authors.affiliation: Department of Orthopedic Surgery, Chungnam National University School of Medicine, Daejeon, Korea.
authors.forename: Jae-Sung
authors.initials: JS
authors.lastname: Ahn
authors.affiliation: Department of Orthopedic Surgery, Chungnam National University School of Medicine, Daejeon, Korea.
authors.forename: Ho-Jin
authors.initials: HJ
authors.lastname: Lee
authors.affiliation: Department of Orthopedic Surgery, Chungnam National University School of Medicine, Daejeon, Korea.
authors.forename: Byung-Kon
authors.initials: BK
authors.lastname: Shin
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D001860:Bone Plates / Q000009:adverse effects / Q000706:statistics & numerical data*; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D065406:Laminoplasty / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D013118:Spinal Cord Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D014025:Titanium / Q000627:therapeutic use*; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D014025:Titanium
keywords: Laminar angle; Laminoplasty; Myelopathy