I recently got an arthroscopic surgery, meniscoctomy, which was the trimming of my tear of my meniscus. could these lead to long term osteoarthritis?

Yes, OA can occur: Any significant wearing of the joint surface articular cartilage, is, by definition, osteoarthritis (oa). There is a spectrum of oa from very mild and sub-clinical, to severe and debilitating. The real-time current status of one's knee cartilage is important, but just as important is the rate of demise. Your knee can reach a steady-state after successful treatment and slow down your progression.