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This is Dr. David
I am sorry you are having such bad tendonitis.
you might benefit from steroid injections into your knees
NSAIDS such as ibuprofen or naproxen can help decrease inflammation.
glucosamine could help.
platelet rich plasma injections into your knees could help calm down inflammation and help with healing.
you might need MRI scans of your knees.
let me know if you have questions.