The MRI report below indeed indicates a tear of the medial (inside) meniscus and the locking and buckling is indicative of the torn bit getting caught in the joint. Unfortunately, meniscus tears aren't very good at healing as there isn't much blood supply and given you've had the symptoms a year, it is unlikely to get better - probably need surgery to repair or trim it back if irrepairable. There is a very good meniscus section in the Information Hub bit of the site. I had a lateral tear too, tried physio forn 5 months, got worse, had surgery, no more locking and buckling (and I an rather older than you)
You also sound to have a small defect in the articular cartilage (think the shiny stuff on a chicken bone, helps the bones move) - luckily it's not full thinkness through to the bone, hopefully it'll settle down with time once the meniscus tear is dealt with
The cyst is possibly caused by the meniscus tear and should go away again
Hopefully that helps for when you talk to the doctor. Good luck, make sure you / your parents ask questions. Being young you should heal up well if you do need an operation
