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Response Shift in Outcome Assessment in Patients Undergoing Total Knee Arthroplasty

¹ Holland Orthopaedic and Arthritic Centre, Sunnybrook Health Sciences Centre, 43 Wellesley Street East, Toronto, ON M4Y 1H1, Canada
² Sunnybrook Spine Program, Division of Orthopaedic Surgery, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Room MG301, Toronto, ON M4N 3M5, Canada. E-mail address for J.A. Finkelstein: joel.finkelstein{at}sunnybrook.ca

Investigation performed at Holland Orthopaedic and Arthritic Centre, Sunnybrook Health Sciences Centre, Toronto, Canada

In support of their research for or preparation of this manuscript, one or more of the authors received grants or outside funding from the Musculoskeletal Grant Program of the Sunnybrook Health Sciences Centre and the PhD Fellowship of the Canadian Institutes of Health Research. None of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Methods: Consecutive candidates undergoing total knee replacement for the treatment of degenerative arthritis completed a Western Ontario and McMaster Universities Osteoarthritis questionnaire preoperatively (Pre-Test). At six months postoperatively, the patients completed two questionnaires: one on how they felt currently (Post-Test), and one on how they perceived themselves to have been prior to surgery (Then-Test). The study cohort comprised 125 subjects, including ninety-one women and thirty-four men, with a mean age (and standard deviation) of 68 ± 9.5 years. The impact of response shift was examined statistically.

Results: With use of the Then-Test methodology, a significant (p < 0.05) response shift was observed in the domains of pain, physical function, and total Western Ontario and McMaster Universities Osteoarthritis score, indicating that patients perceived themselves as having been more disabled than what they had reported before surgery. In measuring outcome, this translates into the treatment effect being greater when adjusting for the presence of a response shift. With the numbers available, age, gender, comorbidity, and amount of recovery did not have a significant impact on response shift when adjusted for the preoperative level of disability.

Conclusions: Patients who have undergone total knee replacement demonstrate a response shift in the measurement of their outcome at six months postoperatively. Although the response shift effect in the present study did not affect the interpretation of clinical results, we have highlighted the different patterns of individuals' psychological adaptation to a change in health status. This is an essential component of assessing the success or failure of surgical interventions as quantified with self-administered quality-of-life measures.

Level of Evidence: Prognostic Level I. See Instructions to Authors for a complete description of levels of evidence.

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