Could you explain how fast arthritis takes to form inside the knee? i would think that it would be a gradually thing. please help and explain?

It depends on the type of arthritis. Infectious arthritis due to bacterial infection can cause damage in a matter of days. Rheumatoid and osteoarthritis may take years to decades. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines.