Familiarity with proper running form is certainly important for any running distance, but I think it is most important for the 800. No other race produces as much sheer fatigue as the 800. Cases could be made for the 400 or the marathon, but in the 400 it's only a 45-50 second race so form is easier to hold as long as you don't run within a second of your pr in the first 200. The marathon can cause you to lose form but it's a different type of fatigue-more of a numbness/general weakness. Are there any ways to help maintain form at the end of the 800? Just lots of drills? Weight sessions right after runs? Before runs? Ab work between intervals? Or just concentrating on keeping it together at the end of sessions when you feel knees driving less high, turnover slowing etc
Interesting on what running form causes what injury. I think most runners focus more on rehabilitation-icing, massage, stretching, exercises etc but not enough on addressing the mechanical factors that led to the injury. I think most people don't know what form errors typically cause which injuries. I sure don't, and I've had dozens of injuries. I think at the collegiate level you have to be fairly mechanically effecient to be that good. But still, even minor form flaws can potentially lead to injuries, especially over the years of training or during periods of high stress.
I have run this over in my head for the past 15 years, just cause I was so frustrated with injuries. If you really breakdown training a good 800m athlete, you are working a fast twitch system (gluts, high outside quads) that have a ton of power but dont want to work for long. If you lose focus and dont concentrate, you will start to "sit" in your stride, hips back, and work the slower twitch "pull" muscles like your hamstrings and soleus--it feels more comfortable since those muscles dont exhaust as quick. These muscles are not smooth, they are woven in with tendon connections, they tear, they tighten and adhese and pull your plantar fascitis over your heel bone (causing the faciitis) or pull your IT band over the outside of your knee. If you are strong muscled they will point all the stress on the bone in your tibia where the soleus connects and crack it. No matter how you feel you must have the runner catching their footstrike with the thigh/glut...
You might see a little waist-bending while running, or the back kick disappears...I think as a coach you can make a big difference with athletes by helping to be their "patience" and telling them to bag a hard day and run alone for 3 days easy to heal up. 1-3 well timed, unplanned breaks like that can be the difference.