This study shows that left handed college pitchers may be more at risk for injury than right handed ptichers through the measurement of biomechanical parameters.
Interesting fact : left handed people make up 10% of the population while left handed pitchers make up 30% of the pitching staffs in Major League and Division I college baseball. Not surprising but interesting stat. That's why I tell me wife if our son is left handed to put a ball in hand straight away!
Here the abstract to the study in The American Journal of Sports Medicine