The purpose of this study is to determine whether a lower dose of corticosteroid injection with ultrasound-guidance for the treatment of knee osteoarthritis can be as effective as a higher dose that is landmark-guided. With landmark-guided dosing, it may be reasonable to use a higher amount of corticosteroid in order to ensure a sufficient amount of the medication is administered, however these injections carry the risk of side effects. Alternatively, with the use of ultrasound, it may be reasonable to use less corticosteroid, possibly decreasing the risk of side effects and increasing patient satisfaction.