The primary purpose of this study was to evaluate the construct validity of the
Questionnaire to Identify Knee Symptoms (QuIKS) measurement scale among individuals
with chronic knee symptoms consistent with osteoarthritis. Construct validity was
assessed using tests of convergent and discriminative validity on 15 pre-specified
hypotheses. The secondary objective was to determine the internal consistency reliability
of the QuIKS. One hundred and five individuals recruited in select physiotherapy clinics
from across Canada were mailed the QuIKS and five other health questionnaires. Fiftyfive individuals completed the questionnaire package. While none of the pre-specified
construct validity hypotheses were met, nine of the validity analyses supported the
construct validity of the QuIKS. The results also supported the internal consistency
reliability of the QuIKS, as Cronbach’s alpha for the scale was 0.81. Overall, the QuIKS
appears to be a valid tool to quantify illness behaviour in individuals with chronic knee
symptoms.