Responsiveness and minimum important change of the Oswestry Disability Index in Italian subjects with symptomatic lumbar spondylolisthesis

Carla Vanti, Silvano Ferrari, Jorge Hugo Villafañe, Pedro Berjano, Marco Monticone

Research output: Contribution to journalArticle


Background: This study aims to investigate the responsiveness and the minimum important change of the Italian version of the Oswestry Disability Index (ODI-I) in subjects with symptomatic specific low back pain associated with lumbar spondylolisthesis (SPL). Materials and methods: One hundred and fifty-one patients with symptomatic SPL completed the ODI-I, a 0–100 numerical rating scale (NRS), and performed the prone and supine bridge tests. The global perception of effectiveness was measured with a 7-point Likert scale. Responsiveness was assessed by distribution methods (minimum detectable change [MDC], effect size [ES], standardized response mean [SRM]) and anchor-based methods (ROC curves). Results: The MDC was 4.23, the ES was 0.95 and the SRM was 1.25. ROC analysis revealed an area under the curve of 0.76 indicating moderate discriminating capacity. The best cut-off point for the dichotomous outcome was 7.5 (sensitivity 90.3%, specificity 56.7%). . Conclusions: The ODI-I proved to be responsive in detecting changes after conservative treatment in subjects with lumbar SPL. Level of evidence: II.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Orthopaedics and Traumatology
Publication statusAccepted/In press - Feb 16 2017



  • Low back pain
  • Oswestry Disability Index
  • Outcome measures
  • Responsiveness
  • Spondylolisthesis

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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