title: C5 palsy after laminectomy and posterior cervical fixation for ossification of posterior longitudinal ligament.
abstract: OBJECTIVE
  To investigate the imaging findings correlated with C5 root palsies in the patients undergoing laminectomy and lateral mass screw fixation for ossification of posterior longitudinal ligament (OPLL), and clarify its pathogenic mechanism.
  
  
  METHODS
  The series included 49 patients with OPLL. Characteristics of preoperative and postoperative x-ray, computed tomography, and magnetic resonance images were compared between the patients with and those without C5 root palsies.
  
  
  RESULTS
  Postoperative C5 root palsies occurred in 9 patients 6 to 64 hours postoperatively. They tended to have increased cervical lordosis and severe OPLL. However, there was no significant positive correlation with an increase in T2-weighted hyperintense foci on magnetic resonance studies.
  
  
  CONCLUSIONS
  The tethering effect on the root seemed to be the main pathogenic mechanism of C5 root palsies in this study.
authors.affiliation: Department of Orthopedic Surgery, Changzheng Hospital, Shanghai, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Deyu
authors.initials: D
authors.lastname: Chen
authors.forename: Xinwei
authors.initials: X
authors.lastname: Wang
authors.forename: Yongfei
authors.initials: Y
authors.lastname: Guo
authors.forename: Zhimin
authors.initials: Z
authors.lastname: He
mesh_terms: D000368:Aged; D002574:Cervical Vertebrae; D015331:Cohort Studies; D005260:Female; D005592:Fracture Fixation / Q000009:adverse effects*; D006801:Humans; D007796:Laminectomy / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D017887:Ossification of Posterior Longitudinal Ligament / Q000601:surgery*; D010243:Paralysis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D011843:Radiculopathy / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D011859:Radiography; D012189:Retrospective Studies