What are some possible complications from knee arthroscopy?

Rare. Infection stiffness scar blood clot anesthesia risks instrument breakage all very rare. A great procedure in well trained hands.
Few complications. Are noted with arthroscopy. Like any surgery there is a risk of infection although significantly less than open procedures. There is a risk of cartilage damage from the instruments. There is a risk of cutaneous nerve injury. Dvt and other medical complications while reported are rare.