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Objective . To study the functional state of the musculoskeletal system in patients with Legg – Calve – Perthes disease after surgical treatment. Material and methods. The study of 31 patients at the age of 8 to 13 years with unilateral Legg – Calve – Perthes disease (LCPD) was performed in the period from 2 to 5 years after surgical treatment. In the control group (15 children), correcting (varus) osteotomy (VO) was fulfilled, in the main group (16 children) – triple pelvic osteotomy (TPO), and the group of healthy children (18 persons) was examined as well. Walking biomechanics was studied using of the STEDIS complex (Neurosoft LLC, Ivanovo, Russia). The vertical balance of the body was evaluated on a stabilometric platform MBN "Biomechanics" (LLC NMF MBN, Moscow). Results. After surgical treatment, the indicators of vertical balance and biometry of the step phases in both groups of children with LCPD did not reach the same level as in healthy individuals at the indicated follow-up dates. The least significant indicators of step phase asymmetry were found in patients after TPO compared with patients after VO. In patients after VO, the destabilization of the center of pressure significantly exceeded that in patients after TPO. Conclusions . Biomechanical studies allow us to compare the functional results of various techniques of surgical treatment of children with unilateral LCPD. After TPO operation, patients have a more complete restoration of the supportability of the affected lower limb compared to VO operation.

Application of biomechanical research methods in evaluating results of surgical treatment of children with Legg – Calve – Perthes disease