The thrower's elbow is subject to conditions and injuries that non-throwing elbows are not. A unique set of injuries can occur, and these are mostly preventable by ensuring proper warm-up and observing pitch counts. It is also advisable to follow the guidelines for pitch types thrown for each age group.
Anatomy of the Normal Elbow
Here is a diagram which gives a look at the inside of the normal shoulder
The Normal Throwing Motion
The throwing motion has been broken down into phases, and this page diagrams and explains each of these phases
What Happens in the Thrower's Elbow
This section will describe what happens in the elbow of throwers that can result in tissue damage, and the eventual need for season or career-ending surgery