Purpose – Relieve pain and swelling behind the knee, the feeling of tightness or fullness that worsens when standing, and alleviate the difficulty of bending at the knee.
Overview – Cyst aspiration is the removal of excess fluid, and a steroid is often injected to fill the cyst and reduce the chance of it returning. Baker’s cysts are membrane-lined, fluid-filled lumps that develop behind the knee. Common causes for Baker’s cysts include arthritis, torn cartilage in the knee, and advanced osteoarthritis. This procedure may be done with image guidance.
Before the procedure – No special preparation is needed for this procedure.
Details – The procedure begins with the application of an anesthetic on top of the cyst. The cyst is punctured with a needle in order to begin aspiration. Then, using a syringe, the fluid is drained from the base of the cyst. A steroid is often injected into the empty cyst in order to reduce inflammation.
After the procedure – Numbness should only last a few hours until the anesthetic wears off. Once the anesthetic wears off, there may be mild discomfort that lasts for a couple of days. There is a chance of the cyst returning. Possible side effects include bruising, swelling, or risk of infection at the injection site.