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When you absolutely need it you should do it. On the other hand , there can be many years of mileage still left on the knee you have. You are still a pretty young guy Ross so unless the pain is disabling , try exercise , etc to see if you can delay it until you are older. Losing just 20 pounds can have a big effect on how your knees feel as there is a huge multiplier of the weightX the force on your knees.
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