Little Leaguers elbow is the result of repetitive stress to the growth plate on the inside of the elbow. The growth plate is a small, soft part of a bone, located near both ends of long bones. The greatest stress occurs during the acceleration phase of throwing a baseball. Growing bones are easily injured because the growth plate is much weaker than the ligaments and muscles that attach to it. Once the growth plates fuse, athletes are more likely to injuries tendons and ligaments instead.