First of all, the MRI report could completely wrong. Maybe get a CT scan w/conrast...or whatever advanced imaging the pros get.
Anyway, there are many "young" althletes with pretty bad arthritis that manage to still do amazing at sports with the help of specific physical therapy, braces and/or anti-inflammatory meds...but they have the very best team of therapists behind them. More surgery may not be necessary in the immediate future.