Tim McMichael wrote:
If this can be caused by an overuse injury that stretches the medial collateral ligament, then my earlier point about improper pulling exercises is accurate, and it means that we have to pay careful attention to how our athletes perform their lifts and drills.
I think what you were being told is more implicated with shortening the muscle from not going through the full range of motion.
The ligament injury would come from a lateral force that would increase the angle. like pitching. hitting a tennis ball, swinging a hammer, a blow to the elbow from lateral to medial, and in the case of PV possibly taking of under. This increased angle DUE TO INJURY would typically not be seen at rest like the first photo of your arm (that would be the normal anatomical carrying angle). If you were to grab the persons wrist with one hand and push on the elbow lateral to medial any increase in the angle would be do to ligament laxity/injury.