oooo that's nasty my man. They don't do those much anymore. You may be in luck because (I assume) you're in good shape, are young, eat well, etc etc. If cortisone, shockwave therapy, acupuncture, active release, stretches, strenghtening etc etc just won't do it, then this really is a last resort to alleviate pain.
It could keep you out of the gym for 4-6 months of heavy lifting...100%
But you'll be able to go in and train with other body parts, you will be doing rehab relatively soon afterwards. When healed, you should have good function back but dont' ever expect to return to function like you were when you were 20-25. Just isn't going to happen. The point is to release the tendon/split it, insert it into a new spot, clean it up so it can contract without causing mechanical pain. Proper rehab and recovery and TIME will allow you to have the best functional outcome.
