Had TKR in 2015 and terrible pain on outside of knee immediately. My doctor said it was fine. I went to another Dr. and revision of center. where the groove is. Got no better. Six yrs. now and pain is worse and feels like cutting sensation in same spot. Revision doc says it is now a spur there and that is why it hurts. Hurt after surgery in 2015 so how could it be a spur causing the pain? It is running down into the foot also. I think he trapped a nerve.