Do i have to have an arthroscopy on my knee for a torn cartilage?

Torn meniscus: If the meniscus tear is symptomatic it is usually best to repair it, the earlier the better, in order not to produce damage to the bearing surface of the knee.

Usually- not always: Not all cartilage and meniscal tears are the same within the knee. Only symptomatic (bothersome) tears are routinely indicated for arthroscopy. You should discuss your knee injury and symptoms with your orthopaedic surgeon.