There is an 11 year old kid on the football team that I coach that has a slip from his doctor that states that he is unable to run laps. He is permitted to do everything else, and can even run as many sprints as we want. I am very uncomfortable with these instructions. I can run the kid 6 x 100 yard sprints, but I can't have him run a 400 yard lap? What happens to me when he drops on the 5th 100 yard sprint? My philosophy as a coach has always been your are physically able to do 100% or you don't participate. I understand that if a kid has a sprained wrist he can run but he can't do push-ups. However, I want him released 100%. I'm not going to have him reinjure something and me be held responsible. The doctor needs to release him to do everything at practice. Has anybody heard of such a medical condition?
You can generate hip problems from running in circles excessively. Many runners have leg-length issues, and many times it is the left leg that is 1/4" - 1/2" shorter than the right. If you constantly turn/pivot one the left this happens. This is usually a result of the pelvis becoming rotated over time, though knee cartilage can compress as well. I've been running on a track since I was 14 and my legs are different lengths as a result, though most of my issues are from a rotated pelvis - which according to my chiropractor is not rare among runners.
I've seen many coaches instruct runners to run some workouts in the opposite direction on a track to prevent injury. Stress fractures in the lower leg are possible as well from constant turns in one direction.
If the kid already has a bad leg length issues or hip rotation issues this could be a cause. However this is speculation...