However, because there are many effective styles of pitching, incorrect throwing mechanics can be difficult to define and determine. One of the most common denominators among virtually all pitchers is "reaching back" with the throwing arm before release and follow-through. This repeated motion is believed to be a major contributing factor in UCL injuries, as it stretches the ligament in an unnatural manner and direction. Simply raising the pitching arm and bringing it forward with a complete follow-through produces the same levels of spin rate, velocity, movement, and location while helping to protect the UCL from unnecessary injury.
