Bakers Cyst is a benign swelling behind the knee joint. It is an accumulation of joint fluid that forms behind the knee. However, it is not a true cyst as the open communication between the synovial sac is maintained. The indications are:
• Rounded, tender swelling behind the knee about the size of a golf ball.
• Pain or pressure in the back of the knee joint, which can travel to the calf muscle.
• Aching or tenderness after exercise and bending the knee.
• Difficulties in bending the joint.
• If you turn all lights out and shine a torch through the lump you should see a red glow around the lump indicating that it is filled with fluid.