I have now been to 4-5 events over the past 2 years where I have seen femurs or tibia/fibula breaks and fractures. Is there any safety gear to try to reduce this? Is there something from the motocross world that could be borrowed?
These seem like more of a comfort thing rather than crash safety, but maybe they offer something: Protective Clothings - Kart pants - Bengio HST
Seems like it would be useful. Padding always helps.
Do we know what kinds of fractures and how they are happening. Compression or?
What is causing the leg injuries? Are they being ejected during a flip?
For offroad moto I wear something very simular to that…McDavid girdle and hard plastic knee protection. And i ride with upper hard plastic armor…we call it roost protection with hard elbow pads. I don’t think the soft armor will prevent breaks. I wear it for impacts. Cuts back on contusions. For street i have sort of the same set up…but built into the gear so i don’t look so robo cop. Lol
Having been ejected myself, I imagine a lot of breaks are related to the foot getting tangled in the pedals and twisting the leg. Thankfully I had the wherewithal to push the kart off while it was barrel-rolling once I knew it wasn’t going to stay shiny side up, so I got clear of it while flying upside down. My biggest fear was not getting my feet free, but I got lucky.
I see where you guys are headed with this - what is causing the problem to try to fix it correctly, but to answer, I am not sure about every incident. I know two have been side impacts. I doubt reaching out to the series would be useful due to HIPAA. Perhaps I can reach out to the ones affected and see if they are willing to discuss.
I broke my left femur when I was younger. Combo that with a staph infection and I wasn’t able to walk for 1.5yrs 
@Numbah26 Promoters are not bound by the HIPAA privacy rule. The purpose of this rule is to protect patients from unauthorized disclosures by “covered entities” like insurers and healthcare workers. It doesn’t mean that no one can disclose your protected health information. It just means that certain people can’t. This is why athletes can’t successfully sue ESPN if a reporter gets a scoop about their injuries.