title: Patient outcomes after decompression and instrumented posterior spinal fusion for degenerative spondylolisthesis.
abstract: METHODS
  A retrospective study of patient outcomes after decompression and fusion for degenerative spondylolisthesis, using the SF-36 survey and a functional questionnaire.
  
  
  BACKGROUND
  In recent studies, patient outcomes have been examined more specifically; however, detailed functional outcomes are not available nor have widely used outcomes instruments been administered.
  
  
  METHODS
  Thirty patients aged more than 40 years (average, 60.1 years) who had degenerative spondylolisthesis were evaluated after decompression and instrumented posterior fusion. Charts and radiographs were also reviewed. Questionnaires were administered by telephone, and consisted of the Medical Outcomes Study short form (SF-36) and 27 questions designed to evaluate function, quality of life, medication usage, and satisfaction with surgical results.
  
  
  RESULTS
  Ninety-three percent of patient's were satisfied with their outcomes. Patients improved significantly in their ability to perform heavy and light activities, participate in social activities, sit, and sleep (P < 0.001) and also improved in pain, depression, and medication usage (P < 0.0001). SF-36 data showed significantly better overall assessment of health in all categories than that in a published cohort of patients with low back pain. The current study group also showed no difference in seven of eight categories when compared with the general population. Fusion rate was 93% at an average of 128 days. Three patients required reoperation: two for pseudarthrosis and one for a deep infection. A poorer outcome, scored by the SF-36, was associated with greater preoperative stenosis (P < 0.05) or occurrence of a complication (P < 0.05).
  
  
  CONCLUSIONS
  Patients treated with decompression and fusion for degenerative spondylolisthesis had improved functional outcomes, when measured by a disease-specific questionnaire and by widely used instruments.
authors: Department of Orthopaedic Surgery, University of California, San Francisco, USA.
authors: S E
authors: SE
authors: Nork
authors: S S
authors: SS
authors: Hu
authors: K L
authors: KL
authors: Workman
authors: P A
authors: PA
authors: Glazer
authors: D S
authors: DS
authors: Bradford
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D001863:Bone Screws; D016009:Chi-Square Distribution; D019299:Decompression, Surgical; D004651:Employment; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D011183:Postoperative Complications; D011859:Radiography; D012189:Retrospective Studies; D013123:Spinal Fusion / Q000009:adverse effects / Q000295:instrumentation*; D013168:Spondylolisthesis / Q000000981:diagnostic imaging / Q000601:surgery*; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires; D016896:Treatment Outcome