I'm thinking it's just your area. There are 6 judo clubs within 20 miles of me and just off the top of my head 12 shotokan schools. 4 BJJ only schools, 9 with Muay Thai, 4 TKD, I have Wing Chun, Muay Thai, Kali, Submission Wrestling, BJJ, and MMA at my school. Judo high injury rate. Not really, what are you comparing the injury rates to?