The Spine Journal
Volume 9, Issue 12 , Pages 1039-1045 , December 2009

Understanding inconsistencies in patient-reported outcomes after spine treatment: response shift phenomena

  • Carolyn E. Schwartz, ScD

      Affiliations

    • DeltaQuest Foundation, Inc., 31 Mitchell Road, Concord, MA 01742, USA
    • Department of Medicine, Tufts University Medical School, Boston, MA, USA
    • Department of Orthopaedic Surgery, Tufts University Medical School, Boston, MA, USA
    • Corresponding Author InformationCorresponding author. DeltaQuest Foundation, Inc., 31 Mitchell Road, Concord, MA 01742, USA. Tel.: (978) 758-1553.
    • ,
  • Joel A. Finkelstein, MD, FRCS(C)

      Affiliations

    • Division of Orthopedic Surgery, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
    • Department of Surgery, University of Toronto, Toronto, Ontario, Canada

Received 2 December 2008 ,Accepted 17 May 2009.

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 FDA device/drug status: not applicable.

 Author disclosure: none.

PII: S1529-9430(09)00225-3

doi: 10.1016/j.spinee.2009.05.010

The Spine Journal
Volume 9, Issue 12 , Pages 1039-1045 , December 2009

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