Repositional-fixation ring for surgical treatment of acetabular fractures (preliminary results of static tests)

Abstract

BACKGROUND: Currently, several types of designs of support rings of M. Muller, Burch-Schneider, rings of the company “Protek” (Switzerland), implanted in the BB are widely used, which are used in the surgical treatment of long-standing fractures of the BB, as a rule, as a device that strengthens the walls of the BB.

AIM: Study of the deformation properties of the repositional-fixing ring.

MATERIALS AND METHODS: For carrying out mechanical tests, a ring with an external diameter of 52 mm was made by the method of sequential sintering using additive technologies by the company “Konmet” LLC, Moscow. Laboratory mechanical tests were carried out by the Testing Laboratory of Medical Devices and Materials of the N.N. Priorov National Medical Research Center of Traumatology and Orthopedics.

RESULTS: As a result of static testing of the ring for compression, tension, torsion, and joint stretching and twisting of the edges of the ring connector, its deformation properties are studied. Load corresponding to the deformation of 2 mm, kN: compression — 0.180; tension — 0.061; torsion (torque corresponding to the angle of rotation of 5 degrees, Nm) — 2.653; joint tension with twisting of the edges of the ring connector (load corresponding to the deformation of 10 mm, kN) — 0.048.

CONCLUSION: The results of the initial study of the deformation behavior of the ring structure show that it is necessary to refine the ring design and further study the deformation and strength characteristics of the ring.

Keywords

acetabular fractures / surgical treatment / open reposition and fixation of acetabular fractures / primary hip replacement / repositional-fixation ring / additive technologies

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