The purpose of this study is to present the latest research in the diagnosis and treatment of the unstable shoulder, with special reference to the shoulder instability in the professional female athletes. The shoulder is the most mobile joint in the human body. The mobility of the shoulder is ensured by the special anatomical relationship of the of the joint bodies, ligaments and muscles surrounding the shoulder joint. Being mobile in all planes, enables humans to perform even the most complex tasks with their hand during everyday routine or during professional work or sports activities. For the aforementioned, besides mobility, stability of the shoulder is another important issue to assure all the activities with upper extremities. On the other hand, such a huge mobility, shoulder joint anatomy and usage of the shoulder in all activities, starting from the simplest tasks during sedentary life to the most demanding ones, such as are necessary in the large number of sports, makes the shoulder especially exposed to a variety of different injuries. With the continuous research of the shoulder anatomy and patho-anatomical patterns of different injuries, increases also the knowledge about the best ways of treatment of various shoulder problems. This paper will present a minimally invasive method for shoulder instability treatment, the so-called arthroscopic stabilization of the shoulder. A group of the sports-active patients who were treated in the Special hospital Aksis, Zagreb, will be statistically analyzed. Active female athletes will be selected and analyzed separately.