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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.
You may be able to feel a bump at the back of the knee, but your condition should be diagnosed by a doctor for proper treatment. It's also possible that the problem is actually referred pain, when you have an injury elsewhere, and it's referred to the knee. Pain in the lower back or spine, or another part of the knee, can travel through nerves and be felt behind the knee. Less Common Causes of Behind-Knee Pain-Popliteus tendonitis is an injury to or inflammation of a small muscle at the back of the knee called the popliteus.-Gastrocnemius tendonitis is an inflammation of a calf muscle tendon that originates at the back of the knee.