A Systematic Review of Estimates of the Minimally Clinically Important Difference and Patient Acceptable Symptom State of the Western Ontario and McMaster Universities Osteoarthritis Index in Patients who Underwent Total Hip and Total Knee Replacement.

Although the WOMAC is a commonly used measure for a single condition, the variability in methods used to calculate MCID and PASS estimates results in a range of values across studies making it unclear whether values reported in the literature can be applied with confidence. Future research is needed to refine methods used to calculate MCIDs and PASS.