In a study of 151 patients with OA and 202 with RA, they found the composite RAPID3 scores were equally high in patients with OA and RA at their first visit (16.0 vs. 15.5, respectively) but higher in OA patients at the 6-month reassessment (14.3 vs. 11.9; P less than .004).
“We can now say that at presentation, OA and RA are similar in MDHAQ/RAPID3 scores, which were adjusted for age and BMI,” Dr. Pincus said. “Both the OA and RA patients improved, but considerably greater improvement in RA versus OA resulted in significantly poorer status for OA versus RA at 6 months.”
However, that’s not to say that OA is a worse disease than RA in every patient, Dr. Pincus was keen to point out. “Some patients with each disease have mild, moderate, or severe disease,” he stated. RA is used as benchmark for a severe disease, so these data highlight that “OA is a severe disease as well.”
This sentiment was the focus of a 2016 white paper produced by OARSI and submitted to the Food and Drug Administration, which states the case for the need to take OA more seriously and for regulatory restrictions to be removed to enable new treatments to be developed.