Re: Aikido & back surgery
I had back surgery (L5-S1). I have taken ukemi for years, and the only injuries I have had were bad landings. The worst was hitting my instep with my heel which caused a sore spot for several days.
I would say you should get cleared from your Dr. Work on core body strength and work on perfecting your rolls and falls. Go slow and it will come. I have fewer back problems when I stay active, and ukemi seems to help keep my back strong.
Just my $.02