When your EP said you might you might need a "tune up" in a year or so he was referring that you might need a 2nd ablation. Due to the high heat used in RFA ablations they ofter cannot remove or change all the affected regions in the heart hence they could damage the heart or the esophagus resulting complications that are significant. That is why ablations often really are 2 stage events. It's not that the heart is changing so much. It's that essentially EPs cannot complete a comprehensive job on the first go around. With your history of Afib often the orthopedist will put you on a blood thinner after a hip or knee replacement. It someone hasn't already prescibed a blood thinner I'd be asking for it right away as you odds of clotting increase just with the replacement alone and then adding Afib makes raises the odds.
The good news is it sounds like you had a good hip replacement and are well on the way to a fast and durable orthopedic recovery.
See your EP now as it will take time to get worked into the system as most of them are always months behind and by then you will be fully healed with your new hip.