The fastest man ever, Usain Bolt, world record holder of the 100 and 200 meter sprints suffers from Scoliosis. This is a condition which causes curvature to the spine. The curvature in his spine has cause his right leg to be slightly shorter than the left leg.
I've also read about other sprinters with lower reputation who also had Scoliosis. For example a Canadian national sprinter used to run third in 4x100 relays to "take advantage" of his uneven leg lengths in the curve.
Is there any links between Scoliosis and leg length differential and sprinting performance? Has there been a study on this?