Knee arthroscopy is a minimally invasive procedure used to diagnose and treat knee joint issues like torn cartilage and ligament tears. It involves inserting a small camera into the knee joint through a tiny incision, allowing the surgeon to visualize and address problems with specialized instruments. Benefits include less postoperative pain and faster recovery compared to traditional surgery, though risks like infection and nerve damage exist. Overall, it offers effective treatment with minimal disruption to daily life.