I had 3 ops on the right knee, 1 ACL and 2 menicus tears, the knee recently started swelling?

Quick background: 3 ops on the right knee, 1 ACL and 2 menicus tears. I have played soccer since I was 5, I am now 46 years old. I exercise the knee daily, play table tennis and soccer once or twice weekly. The knee recently started swelling. I treated it with RICE. Swellings gone. Now very localised pain top of patella and a finger width towards inside of knee. Very painful when attempting a run and sore to the touch. Walking only occasional pain. Occasional slight give way. Lots of grinding, crunching and crackling from the knee. Any ideas pls?

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