I actually started this thread because I had knee surgery in December after a motorcycle crash in September (not my fault!). My biggest concern is falling and deceleration movements because of what was reconstructed in my knee (ACL, made from my quad tendon). My doctor tells me that I am at increased risk of injury from the strength loss in my surgical leg until I can build that back (and maybe never, the studies show some of it may never return). That said, he also says that in the practical sense, I don't need to be overly cautious as the activities I want to do, my age, and the intensity I'm likely to be able to do them at are not significantly associated with reinjury. That said, pain is a real part of becoming an old man, and let me tell you, this has been a humbling experience for me even though I'm barely half the age of most of the people I shoot with. I'm not paranoid, but I also don't want to risk falling if I can help it. I also trashed my other knee in the Army, so dealing with at least some pain isn't new, but the surgery and rehab was a lot worse for a lot longer.
I don't want to wear combat boots. I want to wear boots with lug soles. I think they will have the most grip on gravel and dirt and the other loose surfaces of the range, at least the most of what is practical and what I already have--I'm not going to try to wear football cleats. If I have to, I'll buy another pair or wear my leather soled cowboy boots. But I also don't think lug soles provide me any advantage other than making it less likely I will slip and fall on a loose surface. I don't want to look like a cheater, or hide behind some kind of doctor's exception, but if nobody is going to complain, I want to wear my lug sole boots.
I had a great discussion with my posse today at a CAS match, and it seems like a lot of the people doing this sport have spent at least some time thinking about their footwear because traditionally constructed cowboy boots can be really hard on the feet and knees. I like my conventionally constructed boots and I wear them at more matches than not. But if I have to be on my feet all day, or if the stages have a lot of movement, or if the arthritis is just not cooperating that day, or the surface is loose, something grippy on the bottom is an advantage I don't want to give up unless someone is going to make a big deal out of it.