A few things:
W/o a doubt, are top athletes are injured a lot and I say that by comparing it to the top NCAA and pro athletes in other sports. In NCAA football, I can only think of 2 ‘major’ star athletes who were injured to the point were it kelp them our of games. Consider the fact that football is a violent contact sport and athletes play a game every week. In the NBA, Shaq, Yao Ming and Tony Parker are the only athletes that I can think of whose season in being compromised by injuries. There are 28 NBA teams and they play at least 2 games a week for almost half a year. I respect the fact that there are unique things to being an endurance athlete and injuries are part of the equation, but world class, cyclists and triathletes rarely miss major competitions.
Contrast that with Colorado and Michigan, for an NCAA example, every year, half of their top distance runners are hurt or on the pro level, at least half of the U.S. top distance runner are injured or rumored to be injured. Now, I know we all get sick and injured, even as a weekend warrior runner, it happens to me from time to time. But, as of right now, the situation has gotten particularly bad...our top athletes rarely compete. Except for Lagat, almost no one ran any Europe indoor races, we did not field a competitive World Cross team and over half of the athletes did show up to the U.S. indoor national championship - You can't have a sport where the fans and supporters rarely see it's top athletes.
In the late 70s to early 80s, which was my competitive era, most athletes did their long runs on all concrete, wearing shoes most of today’s athletes wouldn’t yard work in, drank mostly water for hydration, thought peanut butter and honey was best complex carb, competed on 160m flat indoor tracks, ran on XC courses that had roots and ruts (most of same courses used today, but w/o the fixes), competed more frequently, there was very little attitude training, very few massages, no alterGs, most athletes had never heard of ploy metrics and across the board we had better middle distance performances and a lot less injuries. If you talk to some of the Athletes at Villanova, Arkansas and Georgetown during that time, most of them 4 straight years w/o a major injury that kelp them out competition.
With all that said, I am not picking on any particular athlete, program or U.S. distance running in general, I am just agreeing with the thread starter; the fact is, our top athletes are injured a lot. When I was in H.S., I had a poster of Juantorena and Wohlhuter coming off the final turn in the Montreal Olympics; I also had a poster Marty Liquori and John Walker. Between meets like the Sunkist Invitational, Philadelphia Classic, the Baltimore Armory, NJ Armory, Miami Invitational and AU/TAC meets; you could see your heroes on TV about every other weekend. Plain and simple, if you want to grow the sport, you have see the athletes compete.