Journal
RHEUMATOLOGY INTERNATIONAL
Volume 28, Issue 3, Pages 217-223Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00296-007-0420-8
Keywords
item response theory; M-ASES; American Shoulder and Elbow Surgeon's questionnaire
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The modified American Shoulder and Elbow Surgeon's (M-ASES) questionnaire is purported to be a non-region specific functional measure of the entire upper extremity. The purpose of this study was to determine the factor structure of the M-ASES and to determine item-fit of the M-ASES using item response theory (IRT). Analyses included univariate baseline demographics, factor analysis, convergent/construct validation with the SF-12, and graded response IRT of the M-ASES. 964 patients of an orthopedic practice with a variety of upper extremity dysfunctions participated in this trial. The M-ASES demonstrated two dimensions (wrist/hand and shoulder dysfunction) and exhibited excellent discrimination and threshold specification. The instrument correlated well with the mental and physical dimensions of the SF-12. The M-ASES should be considered an excellent tool for measure of whole upper extremity dysfunction.
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