Normally, NSAIDs. Normally, no Surgery, unless he needs knee replacement over time.

I would not rush into surgery at this point. He is still young enough that with rest, the knee may improve with just a simple use of anti-inflammatory medicines such as aspirin, ibuprofen, and acetaminophen for pain. There may come a time where he may need to have his knee scoped in the procedure is very simple. Recovery time is fast. Perhaps at this time, pure conservative therapy would be recommended.