Page 117 - DOS Kongressen 2012 - Abstracts

77.
CONTENT VALIDITY IN A CONDITION-SPECIFIC PATIENT-
RELATED OUTCOME SCORE FOR PATIENTS WITH ANTERIOR
CRUCIATE LIGAMENT INJURIES
Jonathan Comins, Michael Krogsgaard, John Brodersen
Section for Sports Traumatology, M51, Bispebjerg University Hospital, and
Research Unit and Section University of Copenhagen; Section for Sports
Traumatology, M51, Bispebjerg University Hospital , University of
Copenhagen ; Research Unit and Section of General Practice, Department of
Public Health, University of Copenhagen
Background:
Item content in Patient-reported Outcome Scores (PROs) must
be confirmed to be meaningful for the targeted patient population, in order to
validly measure treatment effect. While the items that make up these scales can
be generated from clinicians or from patients, item relevancy and
comprehensiveness can only be confirmed through qualitative interviews with
the targeted patient group. Instruments used to assess patients with anterior
cruciate ligament (ACL) deficiency have not been rigorously developed using
these methods.
Purpose / Aim of Study:
To develop a condition-specific PRO questionnaire
for patients with ACL deficiency.
Materials and Methods:
Using a pool of 157 items with unique content
assembled from 31 knee-specific PROs, focus group and individual cognitive
interviews with patients before and after ACL-reconstruction were conducted
to confirm relevant and irrelevant items, and if necessary to generate new item
content.
Findings / Results:
Fifty-five items were endorsed by the respondents and
grouped into six constructs. Twelve items were original, five items were
modified in content or response structure, and 38 items remained unchanged.
The six constructs, which were endorsed by the respondents were: Activities of
Daily Living (10 items), Psychosocial Impact (5 items), “Looseness” (5 items),
Slackness” (6 items), Symptoms (13 items), and Sport/Recreational Function
(16
items). The construct Slackness had not been described previously.
Conclusions:
This study resulted in the creation of a condition-specific PRO
for patients with ACL deficiency called the Knee Numeric Entity Evaluation
Score (KNEES-ACL).