

That’s in part why pain on the inside is more common than pain on the outside.

With more movement on the inside, there is added compression of the outside of the elbow.

The stretching on the inside tends to happen sooner. At the same time, structures on the outside of the elbow are pushed together (red arrows in picture). During a throw, structures on the inside of the elbow are stretched (blue arrows in picture). Throwing a ball places unique stresses on the elbow.
