Ive been to serval specialist and doctors,done stress scans and x-rays on my knee. been told there is nothing wrong. recently my leg and feet started tingling, its extremely uncomfortable when i bend my knee i have to keep my leg straight?

Knee pain : Tingling in the leg makes me think that there is a neurological problem that can be from a nerve near the knee (common peroneal ) or stemming from the back. It seems like you did not have a MRI? The best way to evaluate your knee is with a good physical examination, without that no one can be sure. It seems like you have damage to the meniscus in the knee.