Experimental Study of Strength of Primary Stability of Bone Fragments When Using Different Types of Intramedullary Anchors

S.A. Khmyzov, A.V. Pashenko, A.A. Tyazhelov, M.Y. Karpinskyi, E.D. Karpinska, I.A. Subbota


Background. Treatment of long bones deformities is one of the key problems in children with impaired bone quality occurred due to the combined nature of the deformities and their recurrence in the postoperative period, the instability of clamps, inability of the patients for the daily activies. Objective: to determine experimentally the strength of the primary stabilization of fragments of long bones using intramedullary clips of various types on the background of violations of the quality of the bone tissue. Materials and methods. The study was conducted in the laboratory of biomechanics in the SI «Sytenko Institute of Spine and Joint Pathology of NAMS of Ukraine» on the plastic models of the tibia by modeling osteotomy in the middle of their third and fixing fragments with titanium elastic rods, rotationally unstable intramedullary telescopic rod, as well as rotationally stable intramedullary telescopic rod by applying the bending load to the middle of the diaphysis model in osteotomy area. The number of deformation was controlled at values of 50, 100, 150, 200 N with the data processed by subsequent measurements of load and recording experiment results. The data were statistically processed; one-way analysis of variance and post hoc test of Duncan were used to compare anchors species; the dependence of the strain on the area intersection model was examined using Pearson’s pair correlation. Results. Best results were obtained on the models with rotation-stable telescopic anchor, the worst when using titanium elastic rods. Conclusions. All types of anchors provide adequate initial fixation stability for crumple (deformation quantity not greater than 5 mm), however, the best results were obtained in models with a rotationally stable telescoping anchor


quality of bone tissue; titanium elastic rods; stability


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