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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.
knee-pain. 1  Nerve impingement at L5-S1 can cause pain in the knees, although a clinical exam is needed to make an accurate diagnosis. Other causes of referred knee pain are injury to the hip joint and damage to the ligaments and meniscus at the knee joint. Joint fusion may alleviate your symptoms.