To reduce the size of the baker's cyst, your doctors may drain the fluid from the cyst using a needle. This is called needle aspiration(draining the fluid) and is often performed with ultrasound guidance. arthroscopic surgery may be recommended to repair the problem or baker's cyst. size of the baker's cyst may be the reason for the swelling at the posterior aspect of the knee. You can do many things such as using compression therapy you can use cryotherapy(cold therapy) which is help reduce swelling.