Ahh ... risk analysis. Espola is not wrong, but his analysis is too shallow. Children who participate in gymnastics, rugby, boxing, karate, rodeo, soccer, baseball, basketball, weightlifting, sailing, climbing, skiing, and almost any other sport one can think of, all risk "crippling injury." So what are the reasons for putting your kids in sport at all?
1. Exercise: Most sports provide a lot of exercise, but the safest and most healthful activity is just doing a lot of walking. Personally, I have never heard of, nor can conceive of a person getting a "crippling injury" by walking, unless stepping in front of a car counts. So forget this soccer stuff; the smart choice is to avoid competitive sports and just walk daily with your child.
2. Mental benefits: Competitive sports are said to provide discipline and teamwork skills, which give life-long benefits. Of course, so do forensic debates, academic decathlons, robotics contests, Boy Scouts, theater and cotillion. Those are all a lot safer than sports. So why choose dangerous sports?
3. Mating Strategy: This is the only one I really believe. We (especially males) play sports to attract mates. In all life as we know it, animals compete. Few fight to the death, but many fight to "crippling injury." Animals compete in other ways too: bowerbirds build elaborate nests; antelopes stott; monkeys howl. Humans are the same: chicks dig artists and singers, but mostly they dig athletes. I believe that, deep down, nearly every kid plays sports to "show off," at least to some degree, which is a mating strategy. We choose dangerous sports because these are the ones that show the most "fitness," from a biological sense. The best athletes seemingly have the best genes, and are first choices when it comes to passing those genes along. Cheerleaders always date quarterbacks; never towel boys.