What are the dangers of medial meniscus surgery?

Few: This is the most commonly performed ortho surgery. Risks include bleeding, pain, infection, damage to nerves (specifically the saphenous) and blood vessels, worsening arthritis down the road if part of the meniscus must be removed, failure of a repair to heal, chance of recurrent tear, failure of pain to resolve. These are all very infrequent and this is typically a very safe procedure.