Purpose: The purpose of this study was to determine the psychometric properties of the International
Knee Documentation Committee (IKDC) score for meniscus injuries of the knee. Methods: Test-retest reliability, content validity, construct validity, and responsiveness
to change were determined for the IKDC score. Knees were excluded if they had ligament
pathology or a chondral defect greater than Outerbridge grade 2. All patients had
meniscus pathology requiring treatment. The study comprised 4 subsets of patients.
Group A consisted of 31 patients who completed an IKDC form at least 2 years after
surgery for meniscus pathology and were then retested within 4 weeks of the primary
questionnaire. Group B contained 264 patients with preoperative IKDC scores that were
used for construct and content validity. Group C contained 50 patients who had a preoperative
IKDC score and completed a short form 12 survey. Group D contained 100 patients with
preoperative and postoperative IKDC scores used to measure responsiveness. Results: The overall IKDC score showed acceptable test-retest reliability with an interclass
correlation of 0.95. There were acceptable floor and ceiling effects. All constructs
tested showed significant differences. These included lower IKDC score with the following:
lower activity level, difficulty with activities of daily living, difficulty with
sports, abnormal knee function, and complex/degenerative meniscus tears. Responsiveness
to change showed a large effect size (2.11) and a large response mean (1.5) for the
overall score. The SE of the measurement was 3.19, and the minimum detectable change
was 8.8 points. Conclusions: The overall IKDC score showed overall acceptable psychometric performance for outcome
measures of meniscus injuries of the knee. Level of Evidence: Level III, testing of previously developed diagnostic criteria in nonconsecutive
patients.
Key Words
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Article Info
Footnotes
The authors report no conflict of interest.
Recipient of the 2006 AANA (Arthroscopy Association of North America) Fellows Clinical Essay Award.
Identification
Copyright
© 2007 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
