Going it alone is not going to be easy. You will definitely not be able to drive, especially since it is your right leg. Getting to the hotel, and from there to the airport could be done easily by taxi, so I would not plan on renting a car. However, you will be on crutches, so you will not be able to carry any luggage. When I flew home from Columbia (I flew home on the fifth day with great help from my wife), I also had a layover in Atlanta, but that part was no problem at all. Just make sure that the airline has a wheelchair and attendant waiting for you at the gate, and they will get you from one gate to the other without any problem. Once again, this does not account for any baggage other than what you could carry on your lap in the wheelchair, since the attendant will have both hands busy with the wheelchair. In less you make other arrangements, you will likely be carrying the ice machine that they give you to take home, and there is no way that you will be able to carry that even a few feet without help.
I would look into whether the airline in Columbia can arrange for a wheelchair attendant to meet you at the taxi. If the hotel can get your bag to and from the taxi, and the airline can arrange a wheelchair from the taxi through each succeeding terminal, and you don't take anything bigger than what you could carry on your lap while in a wheelchair, you might be able to pull it off.
Please run any ideas by either Lee or Nancy, since I am sure that they have advised on this many times before.