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Less common causes of posterior knee pain. Referred pain is where an injury or problem elsewhere causes pain at the back of the knee. This can be from the lower back or lumbar spine and pain is referred down into the knee through the sciatic nerve. Or pain from the patellofemoral joint or between the kneecap and thigh bone can also refer pain into the back of the knee.
What is a popliteal cyst. In the hollow at the back of the knee is a bursa or small sack of fluid used to help lubricate the joint. A fairly uncommon condition is when the back of the knee joint gets swollen and causes the bursa to swell as well. Bakers cyst is a rounded swelling at the back of the knee. It is often about the size of a golf ball but can vary over time. A sensation of pressure in the back of the joint will be felt which may go down into the calf muscle.