A 71-year-old woman presents with bilateral hip pain and stiffness that is worse on the right side. She reports this pain is the worst when she takes her afternoon walk and is typically most painful at the beginning of her walk. The pain usually dissipates while she relaxes when she returns home. Her medical history includes diabetes, hypertension, obesity, and migraines. On exam, the right hip is free of edema, warmth, and erythema. You note crepitus to bilateral hips. Which of the following is the most appropriate diagnostic test for the suspected condition? C-reactive protein Erythrocyte sedimentation rate Radiographic imaging Rheumatoid factor