1, laboratory tests: blood routine, protein electrophoresis, immune complexes and serum complement are generally in the normal range. Patients with concomitant synovitis may have mildly elevated C-reactive protein (CRP) and hematocrit (ESR). Secondary patients may present with abnormal laboratory tests of the primary disease. Jiang Yinghai, Department of Pain, Henan Provincial People’s Hospital
2. Radiographic examination: asymmetric joint space narrowing, subchondral bone sclerosis and/or cystic changes, joint edge hyperplasia and bone redundancy formation or different degrees of joint effusion, free bodies or joint deformation visible in some joints.