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Surgical treatment of patients with tumoral defeat of pelvic bones, of preacetabular region, in particular, is one of the most challenging topics of modern oncorthopedics. Currently, one of the most modern methods of reconstruction of the pelvic bones is the use of modular endoprostheses based on the conical leg, the advantage of which is the ability to intraoperatively simulate an endoprosthesis that best meets the specific clinical situation.    Purpose of research.  To assess the benefits of modular endoprosthesis of the acetabulum in patients with tumoral defeat periacetabular region.   Patients and methods . Within the period of 2011–2018 30 patients underwent surgical treatment in form of periacetabular resection with a modular endoprosthesis reconstruction in P.Hertsen Moscow Oncology Research Institute – Branch of National Medical Research Radiological Centre of Ministry of Health of Russian Federation. There were 13 men (43%) and 17 women (57%). The median age was 45 years (23–63 years). Primary bone cancers were in 19 (63%) patients, giant cell tumors in 5 (17%), locally advanced soft tissue sarcoma in 1 (3%), solitary metastases of kidney cancer in 2 (7%), and recurrent sarcomas after previous surgical treatment in 3 (10%) patients.   Results . The average duration of the operation was 310 min (145–520 min), the volume of intraoperative blood loss was 5520 ml (600–20 000 ml). The positive edge of resection according to the results of the planned morphological study was revealed in 3 (10%) patients. The average follow-up period was 36 months (4-73 months). Disease progression in terms of 6 to 40 months was revealed in 10 (33%) patients. 8 (27%) patients from disease progression. Complications of different types were diagnosed in 11 (37%) patients, among whom infectious complications prevailed 9 (30%). The average value of the functional results on a scale MSTS accounted for 59% (15 to 82%).    Conclusion.  The use of modular systems of endoprosthesis replacement of the acetabulum and hip joint in tumor lesions is a promising surgical technique that allows to achieve adequate functional results with a comparable number of postoperative complications.

THE RESULTS OF MODULAR ENDOPROSTHESIS OF PERIACETABULAR REGION IN TUMOR LESIONS OF THE ACETABULUM AND HIP JOINT