Oh no! Poor Monty!! I’m so sorry to hear about his accident
I’m not sure obedience classes will help keep him out of this kind of trouble, although it’s probably worth a try. He may become more responsive and obedient which is wonderful. But even if he’s better behaved when you’re around to tell him what and what not to do, that doesn’t necessarily mean he won’t jump off furniture, run into things, climb on things etc, when you aren’t right there.
If you train him anything (obedience, tricks, agility, nose work) as often as possible in short sessions that might help occupy his brain and get him to be a little less wild in the house.
Just my thoughts.
Kip is a VERY high energy dog, but he is almost always calm and well behaved in the house. The only time he is crazy in the house is when he’s supposed to be resting after an injury because he is so bored that he is just bouncing off the walls. The only reason Kip is normally calm in the house is he gets tons of exercise, off leash running on the farm, herding cattle, agility training, trick training, etc.. And even then He still manages to get injured sometimes because he is so crazy outside
So anyway, I don’t have all the answers but I feel your pain!