These can be acute in the form of a single event injury, which can lead to dislocation or a fracture or a tear of muscle. Repetitive micro trauma over a prolonged period of time, which is very common in profession sports like overhead throwing, racket sports, javelin throwing. People who are involved in overhead throwing activities need to generate significant amount of force by bringing their arm into extreme abduction, that is the extreme position. When you do this, the structures of the anterior or front of the shoulder joints are stretched. There might be a significant damage if the core muscles are weak. Such injuries are called internal impingement syndrome. Internal impingement syndrome is, caused when an excess stretching of tissues, shoulder muscles inside the joint and labrum touch at a particular point of contact, that repeated activity leads to small tears of the structures inside the joint. Throwers are prone to get injuries on the slap regions.

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