Knee-specific quality-of-life instruments: which ones measure symptoms and disabilities most important to patients?
BACKGROUND
Knee-specific quality-of-life instruments are commonly used outcome measures. However, they have not been compared for their ability to detect symptoms and disabilities important to patients.


METHODS
Cohort study (diagnosis); Level of evidence, 1.


METHODS
Subjective portions of 11 knee-specific instruments were consolidated. The frequency and importance of each item were assessed. One hundred fifty-three patients with anterior cruciate ligament ruptures, isolated meniscal tears, or osteoarthritis were polled. Instruments were ranked according to the number of items with high mean importance, high frequency importance product, and low mean importance, and according to the number endorsed by at least 51% of patients.


RESULTS
For anterior cruciate ligament tears, the Mohtadi quality-of-life instrument scored highest in 3 categories. For meniscal tears, the Western Ontario Meniscal Evaluation Tool scored highly in all 4 categories. For osteoarthritis, the Western Ontario and McMaster Universities Osteoarthritis Index scored highly in 4 categories. Of the general knee instruments, the International Knee Documentation Committee Standard Evaluation Form and the Knee Injury and Osteoarthritis Outcome Score scored favorably.


CONCLUSIONS
The Mohtadi quality-of-life instrument, Western Ontario Meniscal Evaluation Tool, and Western Ontario and McMaster Universities Osteoarthritis Index-disease-specific instruments-contain many items important to patients. Of general knee instruments studied, the International Knee Documentation Committee Standard Evaluation Form and the Knee Injury and Osteoarthritis Outcome Score contain the most items important to patients.


CONCLUSIONS
This study guides clinicians and researchers in selecting instruments that ensure that the patient's perspective is considered for outcome studies involving 3 common knee disorders.
Tanner
Suzanne M
SM
Gundersen Lutheran Sports Medicine, Onalaska, WI 54650, USA. smtanner@gundluth.org
Dainty
Katie N
KN
Marx
Robert G
RG
Kirkley
Alexandra
A
D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000070598:Anterior Cruciate Ligament Injuries; D015331:Cohort Studies; D004185:Disability Evaluation; D004644:Emotions; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000175:diagnosis* / Q000523:psychology; D008019:Life Style; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000175:diagnosis* / Q000523:psychology; D011788:Quality of Life; D012008:Recurrence; D012680:Sensitivity and Specificity; D013177:Sports; D011795:Surveys and Questionnaires; D000070600:Tibial Meniscus Injuries