The patient-specific functional scale: psychometrics, clinimetrics, and application as a clinical outcome measure.

Study Design: Systematic review of the literature.

Objective: To summarize peer-reviewed literature on the reliability, validity, and responsiveness of the Patient-Specific Functional Scale (PSFS), and to identify its use as an outcome measure.

Methods: Searches were performed of several electronic databases from 1995 to May 2010.