Certolizumab and Lower Extremity Lymph Flow in Rheumatoid Arthritis (RA)

This open-label pilot study will select subjects who are inadequate responders to methotrexate. These subjects will receive certolizumab subcutaneously on a monthly basis for six months. The study is attempting to determine the following: 1. Is lymphatic flow altered in the extremities of RA patients with an inflamed knee? 2. Is resolution of synovitis associated with a restoration of lymphatic flow and lymph node volume following therapy with certolizumab? 3. Can Doppler ultrasound be used to detect and follow alterations of lymph node size?