4. Hyper-rotation
Another way that you could get a rotator cuff tear is if your arm is hyper-rotated. There are many things that could lead to this. Poor form in sports like gymnastics could lead to hyper-rotation. Another way that your arm might become hyper-rotated is during grappling sports such as Judo or Brazilian Jiu-Jitsu. There are certain joint locks such as the Kimura that could lead to hyper-rotation.
When your arm is rotated beyond its normal range of motion, the four muscles that make up your rotator cuff could separate and tear leading to a torn cuff. If you detect a tear during any athletic activity, you should immediately stop and get yourself checked out before resuming. Many athletes worsen their injury because they ignore it until they finish their performance. This also holds true for football players with brain damage who ignore any symptoms during a game and only get themselves checked out afterward.