What are the causes of osteoarthritis at an age of 36?

Can you answer guptm’s question about Arthritis?:

Please help me find out the causes of osteoarthritis that happened to my brother. How can it occur so early, I am surprised, when generally it is associated with old age? My brother is in good shape and keeps fit.

Can cartilage grow again? Over how many years? I know the growth is very slow.

Please tell me…
Thanks

Hip Septic Arthritis

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