2. Locking
Beyond a grinding feeling, you might also feel like your shoulder becomes locked sometimes. This is, again, due to the labrum’s function in keeping your scapula and humerus in place. Normally, the two bones are able to move freely past one another thanks to the labrum serving as a buffer between them. When the labrum is torn, however, they’ll be directly contacting each other and thus could become stuck.
If your scapula and humerus get caught on each other then you’ll feel like your shoulder is locked. Don’t force your shoulder to “unlock” in this case as you’ll likely just cause more damage to the bone and tissue. Instead, head straight to the nearest ER so that a doctor can take a look at you. They’ll likely seek to immobilize the injury so that the bones don’t cause damage to one another. Forcing your shoulder to unlock will only make things worst.