Background. Traumatic instability of a shoulder joint accounts up to 1,7 % of all injuries herewith 50 % of recurrence of dislocation fall for young people and the results of treatment do not always correspond to neither doctors’ nor patients’ expectations.

Objective. To assess the types of damages of a rotator- biсipital complex detected at patients with chronic post-traumatic instability of a shoulder joint.

Based on the study of preoperative diagnostic data and the results of arthroscopic examination, to describe the damage of the rotator-biсipital complex (rotator cuff of the shoulder, tendon of the long biceps head, pulley) at patients with chronic post-traumatic instability.

Method. We analyzed the results of a survey of 290 patients who applied for admission at the period from 2006 till 2017. The study was agreed with the ethics commissions on the basis of medical institutions and it was absolutely open-minded. Following the goal set, the authors identified 3 clinical variants of post-traumatic instability, depending on the prevailing direction of the dislocation. The authors studied their morphogenesis of lesions in different variants of posttraumatic instability of the shoulder.

Results. While diagnosing the damages of soft-bone structures of a shoulder joint there were detected the changes in all the cases.

Conclusions. Mechanogenesis, underlying the occurrence of the damage, allows us to identify 3 main clinical types of posttraumatic instability of a shoulder joint with characteristic for them anatomomorphological manifestations.

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