What needs to be done when the initial evaluation is unrevealing and the arthritis persists?
If the initial evaluation was carefully accomplished, a period of watchful waiting is often useful at this time. As noted previously, some processes will resolve spontaneously. Others become polyarticular, and the differential diagnosis will change to reflect the new joint involvement. New findings, such as the skin rash of psoriasis, occasionally emerge to aid in diagnosis. In a small number of patients, monoarticular arthritis persists and further evaluation for chronic monoarticular arthritis must be undertaken.