Will I need surgery on my knee?

No, I don't think you'll need to have surgery on your knee. Any kind of injury to a joint, especially the knee, takes about a year to heal completely. Based on my experience, I would strongly advise you to not have surgery unless you're in severe pain. Sometimes a surgery can create a greater problem than you had. Just take it easy on that knee, and if you're fat, losing weight would help greatly.