Using Ultrasonography to Predict Clinical Response to Intraarticular Corticosteroids in Knee Osteoarthritis

The primary purposes of this study are the following: 1. To evaluate whether the presence of inflammatory knee osteoarthritis as determined by ultrasonography can be used as a clinical predictor of patient response to intra-articular corticosteroids. 2. To prospectively evaluate clinical responsiveness of intraarticular corticosteroids with the inflammatory phenotype of knee OA using a randomized, placebo controlled clinical design. 3. To evaluate whether lower extremity strength is improved with intraarticular corticosteroid injection. The investigators hypothesize that patients with signs of inflammation by ultrasonography such as synovitis and effusion will respond better to intraarticular corticosteroid injection.