title: Surgical experience with symptomatic thoracic ossification of the ligamentum flavum.
abstract: OBJECTIVE
  Symptomatic thoracic ossification of the ligamentum flavum (OLF) is rare, and its prognostic factors remain unclear. The authors retrospectively studied 24 patients with surgically treated thoracic OLF to delineate its prognostic factor.
  
  
  METHODS
  The clinical manifestations, radiological studies, surgical records, and pathological findings were reviewed. Preoperative and postoperative neurological data were reappraised using the American Spinal Injury Association and modified Japanese Orthopaedic Association (JOA) scoring systems. Spearman rank-correlation coefficients and nonparametric tests were used to analyze the correlations between the variables of patient characteristics, preoperative duration of symptoms, preoperative neurological status, associated spinal disorder(s) other than thoracic OLF, and the final functional outcome.
  
  
  CONCLUSIONS
  Decompressive surgery is indicated in patients in whom symptomatic thoracic spinal cord compression is caused by intruding OLF. Magnetic resonance imaging can provide sufficient clues for the diagnosis of thoracic OLF. Higher preoperative modified JOA scores of 3 and 4 are positively correlated with better postoperatiVe functional recovery than lower scores. Surgery should be performed as soon as possible before independent ambulatory function is impaired.
authors.affiliation: Departments of Neurosurgery and Pathology, Chang Gung University, Taoyuan, Taiwan, Republic of China. liao2901@adm.cgmh.org.tw
authors.forename: Cheng-Chih
authors.initials: CC
authors.lastname: Liao
authors.forename: Tzu-Yung
authors.initials: TY
authors.lastname: Chen
authors.forename: Shih-Ming
authors.initials: SM
authors.lastname: Jung
authors.forename: Li-Rong
authors.initials: LR
authors.lastname: Chen
mesh_terms: D000368:Aged; D019299:Decompression, Surgical / Q000379:methods; D005260:Female; D006801:Humans; D017843:Ligamentum Flavum / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D011182:Postoperative Care; D011300:Preoperative Care; D012189:Retrospective Studies; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D014057:Tomography, X-Ray Computed