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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.
Pain on the front part of the leg that is felt deep in the center of the knee can often be from wear of this cartilage. This cartilage wear is called chondromalacia and the pain syndrome may be called patellofemoral syndrome (or PFS for short). There are many causes for anterior knee pain. Overuse in work or exercise, sports injuries, arthritis, and even flat feet have been implicated in causing this type of pain.