Do you find MRI helpful to differentiate early erosive OA from psoriatic arthritis when early X-ray changes in both conditions may be hard to distinguish?  

This is a great question to discuss. I do not in general let imaging dictate my decision about a diagnosis but factor it into the entire evaluation. I find the examination in conjunction with radiographs of the hands AND the feet help me sort out many of these issues. Symmetry, distribution, and par...