Golfers elbow confirmed on mri. Ortho recommends surgery. What does this entail?

Last resort. Be sure that you have exhausted all conservative treatments to include pt, meds, bracing, and injections. If all has failed and the pain is limiting function and quality of life then surgery may be an option. This often is done by releasing the tendon in this area. Be sure to have all of your questions answered prior to surgery. If it means seeing the ortho again, then do it!