Do not wait for this to go away...My Husband's knee surgeon told him it would go away, then after my husband complaining for weeks he finally ordered a MRI of his back and told him the issue was spinal stenois in his lower lumbar and referred him to a spinal surgeon. However because of my research on this page we found several people with same issue and were able to get our Primary Physican to order an ABI test to test the blood flow to his foot and the test revealed there were major blood flow issues. He had an angiogram today and the Cardiologist said that the blood flow was restricted right behind the knee and as soon as he completed the procedure the blood flow was resored to his foot and his foot warmed up immediately. It's too soon to tell if his foot pain will go away, but praying he will get some relief....I'm furious that his Knee surgeon would not listen to him and he has suffered needlessly.