Is surgery the only way to fix a medial meniscus tear in the knee? Can someone having burning and there knee?

Knee surgery. A meniscal tear can be treated conservatively or non operatively with physical therapy and a knee sleeve understanding of course that this will not "heal" the tear. As long as one is not experiencing "locking" symptoms and decreased range of motion with stiffness -assuming of course you do not have dramatic arthritis there is no immediate rush for knee arthroscopy.
Not the only option. Some meniscal tears are degenerative and minimally symptomatic. Treatments can be directed at symptomatic relief, with nsaids, knee sleeves, and cortisone injections. Unfortunately, if these fail and symptoms continue, then surgery usually can help. Burning in the knee can be from other sources separate from the meniscus.