title: The influence of preoperative back pain on the outcome of lumbar decompression surgery.
abstract: METHODS
  Prospective study with 12-month follow-up.
  
  
  OBJECTIVE
  To examine how the relative severity of low back pain (LBP) to leg/buttock pain (LP) influences the outcome of decompression surgery for spinal stenosis.
  
  
  BACKGROUND
  Decompression surgery is a common treatment for lumbar spinal canal stenosis, with generally good outcome. However, concomitant LBP at presentation can make it difficult to decide whether decompression alone will result in a good overall outcome.
  
  
  METHODS
  The Spine Society of Europe Spine Tango system was used to acquire the data from 221 patients. Inclusion criteria were lumbar degenerative spinal stenosis, first-time surgery, maximum 3 affected levels, and decompression as the only procedure. Before and 12 months after surgery, patients completed the multidimensional Core Outcome Measures Index (COMI; includes 0-10 LP and LBP scales); at 12 months, global outcome was rated on a Likert-scale and dichotomized into "good" and "poor" groups.
  
  
  RESULTS
  There was a low but significant positive correlation between baseline LP-minus-LBP scores and both improvement in the multidimensional COMI score after 12 months (r = 0.21, P = 0.003) and the score on the 12-month global outcome scale (r = 0.19, P = 0.007). In the good outcome group, mean baseline LP was 2.3 (+/-3.7) points higher than LBP; in the poor group, the corresponding value was 0.8 (+/-3.4) (P = 0.01 between groups). In multivariate regression analyses (controlling for age, gender, comorbidity), baseline LBP intensity was the most significant predictor of the 12-month COMI score, and preoperative LP-minus-LBP score of the global outcome (each P < 0.05).
  
  
  CONCLUSIONS
  Overall, greater back pain relative to LP at baseline was associated with a significantly worse outcome after decompression. This finding seems intuitive, but has rarely been quantified in the many predictor studies conducted to date. Consideration of relative LBP and LP scores may assist in clinical decision-making and in establishing realistic patient expectations.
authors.affiliation: Spine Center, Schulthess Klinik, Zürich, Switzerland.
authors.forename: Frank S
authors.initials: FS
authors.lastname: Kleinstück
authors.forename: Dieter
authors.initials: D
authors.lastname: Grob
authors.forename: Friederike
authors.initials: F
authors.lastname: Lattig
authors.forename: Viktor
authors.initials: V
authors.lastname: Bartanusz
authors.forename: Francois
authors.initials: F
authors.lastname: Porchet
authors.forename: Dezsö
authors.initials: D
authors.lastname: Jeszenszky
authors.forename: David
authors.initials: D
authors.lastname: O'Riordan
authors.forename: Anne F
authors.initials: AF
authors.lastname: Mannion
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001416:Back Pain / Q000503:physiopathology*; D019299:Decompression, Surgical / Q000379:methods*; D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D017063:Outcome Assessment, Health Care; D011446:Prospective Studies; D012044:Regression Analysis; D013130:Spinal Stenosis / Q000601:surgery*; D013997:Time Factors