Ultrasonographic assessment of Baker's cysts after intra-articular corticosteroid injection in knee osteoarthritis.

Purpose: To assess sonographic changes in Baker's cysts (BCs) of patients with knee osteoarthritis after a single intra-articular corticosteroid injection.

Methods: Thirty patients with knee osteoarthritis complicated with a symptomatic BC received a single intra-articular injection of 40 mg triamcinolone acetonide. Knee pain, swelling, and range of motion were evaluated.