Construct Validation of a Knee-Specific Functional Status Measure: A Comparative Study Between the United States and Israel

BACKGROUND: Comparative effectiveness research (CER) requires valid outcome measures that discriminate patients by risk factors in similar ways across settings. Standardized functional status (FS) measures in physical therapy are used routinely in multiple countries, creating the potential for CER among countries. OBJECTIVE: The purpose of this study was to assess known-groups construct validity of a knee-specific FS measure within and between …