The goal of our work of optimization of the treatment of postoperative hernias is to improve the results of treatment of patients with median and median-lateral postoperative hernias of medium (W2) and large (W3) sizes by developing new surgical techniques. The main questions it aims to answer are: 1. To study the topographic and variant anatomy of vessels and nerves in the retromuscular, preperitoneal, postperitoneal and pre-abdominal cell spaces of the anterior abdominal wall. To determine the most probable sources of blood flow and lymph from the anatomical formations forming the bed of the endoprosthesis. 2. To develop technical, surgical techniques that allow to form an implant bed with minimal traumatization of blood vessels and nerves and reduce the risk of postoperative complications. 3. To develop a technique for plasty of the anterior abdominal wall in mid-lateral postoperative hernias with a combination of retromuscular and subaponeurotic spaces. The researchers will compare an experimental group in which a new method of preparing the implant place will be used and a control group in which standard methods of treating postoperative ventral hernias were used to see whether the new method affects the improvement of the postoperative period and the reduction of complications.