Severe pain in knee

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Has anyone had horrible pain in the knee like the muscles are so tight and you can’t straighten your leg out all the way without feeling horrible pain. I have had this for eight months after a long plane flight. I was checked for a blood clot in my leg that was negative. X-rays taken nothing broke. I do have arthritis in my knees but here’s the thing only one knee hurts not the other. I did go to orthopedic surgeon who said I need knee replacement in both legs but to wait until I have completed my taper. I had a cortisone shot that took all the pain away for a week but it came roaring back. I don’t think this could be withdrawals but it does make me wonder. It’s like the muscles are a tight rubber band and I am literally stretching them to just straighten my leg. Any thoughts?