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The common cause of behind knee pain along with leg and back pain may be formation of a cyst at the back of the knee. Other causes could be Peripheral neuropathy, Sciatica, Stroke and many other causes. Did you go for an MRI of the leg? MRI of the leg as well as spine are necessary for the diagnosis. Please consult a neurologist and orthopaedic surgeon for diagnosis and treatment. Hope this helps you. Take care and regards!