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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.
Popliteus Injury. The Popliteus is a small muscle located at the back of the knee joint. An injury or strain to the muscle or tendon can cause pain at the back of the knee.ymptoms of a popliteus injury include pain at the back of the knee joint. There will be tenderness when pressing in at the back of the knee. Pain will be reproduced when the knee is bent against resistance whilst the lower leg or tibia bone is rotated outwards. Athletes with this injury commonly have tight hamstrings.