The other athletes that get SLAP lesions the most are baseball pitchers.
When the pitcher is winding up the ball to throw right as the ball is being accelerated forwards there is an extreme external rotation/flexion torque on the shoulder.
Tim Lincecum for example
The left most applies the most to kipping pullups.
Well, when you look at kipping pullups what do you see at the bottom of the pullup:
Pretty self explanatory really.
Okay, so the things that I've seen that tend to be risk factors for SLAP lesions are:
Poor technique -- obviously if you're jerking down from the kipping pullup that's putting a lot more stress on your shoulders than not.
Being weak -- women in general have this issue with kipping pullups. When you don't have as much muscle to absorb the forces at the bottom of the pullup the other soft tissue structures like the labrum (where the long head of the biceps connects into) absorbs the force.
Accumulated force of the long head biceps tendon pulling on the superior labrum site where it conects it yields...... superior labrum anterior to posterior tear.... who woulda thought. As the arm is being forced backwards and out the front of the tendon is pulling at the anterior part of the super labrum and thus tears anterior to posterior.
Same mechanism as a pitcher.
Hypermobile -- again an issue that affects women more than men due to hormones and such. Obviously, muscles are weaker near the ends of their range of motion, and the more motion you have the weaker the muscles at the end are.... and well, the other structures pick and the forces and.... tear.
In general, if you are male, strong, generally inflexible, and have good technique you will be less susceptible to a SLAP lesion if you do kipping pullups. Hence why you almost never see this issue with the "elite" athletes.
You mostly see males with crappy technique getting SLAP lesions. And women who are weak and hypermobile (which often go with one another).
If you're a women, weak, hypermobile, and don't know how to do kipping pullups I would absolutely suggest not trying to learn them at least until you stronger. Much stronger.
/end anatomy and biomechanics lesson