"Squat Lifts likely the cause of of stress fractures in Young Athletes." just came out. I couldn't find the actual research the article was based on.
My personal opinion. I don't think 13 year olds should be back squatting. I started at 14 and by my senior year of high school at 163lb could squat 465 for a single. I think it had direct correlation to improvement in sprint times and in football performance. I think it has a lot to do with later episodes of back pain in my 30's.
At the time I had no strength coach and no Internet back then. I had Muscle and Fitness. I had never seen a split squat or a trap bar. No one did heavy sled toes. No one did deadlifts where I grew up.
Looking back I can see all the benefits and all the consequences of squatting. What I would do different if I could send my younger self a message. Learn to deadlift with perfect form, don't max out. Quit benching (another article). Trap bar deadlift. Do lots of single leg work. Spend lots of time pulling a sled. Only start back squatting in college, if you hit a plateau with your other lifts. I managed to squat 515 for 3 as a senior in college. Not much improvement in four years. Go to the well to early and you eventually will run out of adaptations to make for continual improvement. (Jim Wendler recently talked about the use of bands and chains in lifting only if you stalled) Same reasoning.
Squatting isn't evil. There are just potential consequences to it. I don't think it's healthy to heavy back squat. But, playing football isn't healthy, rugby or bobsleigh. But they are awesome, and to me were worth it.. Back squatting has a heavy cost/benefit potentially on both ends. Read the article and interpret the info as you see fit.