Universal reposition and fixation ring for surgical treatment of acetabulum fractures: preliminary results of laboratory static tests

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Abstract

BACKGROUND: Several structures are widely used in the surgical treatment of long-standing fractures of the BB, such as support rings of M. Muller, Burch–Schneider, rings of PROTEK (Switzerland) implanted in the BB. In traumatology practice, rings are used to strengthen fractured walls. However, these rings are not functionally designed for open reposition and fixation of columns and fractures, followed by TBS endoprosthetics with cement fixation of the components of the endoprosthesis. Recently, primary endoprosthetics of EP TBS became the trend for displaced fractures of the BB, which is considered the best option for surgical treatment of BB fractures. In the literature, no analogs of our ring were available, which provides CHP in the treatment of BB fractures.

AIM: To study the deformation properties of a repositional fixation ring with an outer diameter of 52 mm with a stiffening rib.

MATERIALS AND METHODS: A ring has been developed for the surgical treatment of acetabulum fractures (Patent for Invention No. 2692526 dated 26.06.2019 under Application No. 2018133671 dated 25.09.2018.; Bul. No. 18 dated 26.06.2019). For mechanical testing, a ring with an outer diameter of 52 mm with a stiffening rib was manufactured by sequential sintering using additive technologies by Konmet LLC (Moscow). Laboratory mechanical tests were conducted by the Testing Laboratory of Medical Devices and Materials of the FSBI “NMIC TO named after N.N. Priorov” (Moscow).

RESULTS: A static testing of a ring with a stiffener for compression, stretching, torsion, joint stretching, and twisting of the edges of the ring connector was performed, and its deformation properties and reaction to external loads during static tests were examined. The load corresponded to the deformation of 2 mm, kN; compression, 0.209; tension, 0.082; torsion (angle of rotation of 5 degrees, Nm), 9.422; and joint stretching with twisting of the edges of the ring connector (load corresponding to the deformation of 10 mm, kN), 0.060.

CONCLUSION: The results of the initial study of the deformation behaviors of the new ring design clearly show the elastic nature and deformation properties of the ring, which were attributed to the stiffening rib. The positive primary results of studying the deformation behaviors of the ring reinforced with a stiffening rib indicate the possibility for clinical trials and the direction of further refinement of the design..

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About the authors

Aleksandr I. Kolesnik

Priorov National Medical Research Centre for Traumatology and Orthopadics; Cytoproject LLC

Author for correspondence.
Email: ko-lesnik@mail.ru
ORCID iD: 0000-0003-1435-8743
SPIN-code: 6305-2246

MD, Dr. Sci. (Med.), Professor

Russian Federation, Moscow; Moscow

Nikolay S. Gavryushenko

Priorov National Medical Research Centre for Traumatology and Orthopadics

Email: testlabcito@mail.ru
ORCID iD: 0000-0002-7198-433X
SPIN-code: 3335-6472

MD, Dr. Sci. (Tech.), Professor

Russian Federation, Moscow

Leonid V. Fomin

Priorov National Medical Research Centre for Traumatology and Orthopadics; Research Institute of Mechanics, Lomonosov Moscow State University

Email: fleonid1975@mail.ru
ORCID iD: 0000-0002-9075-5049
SPIN-code: 7186-8776

MD, Cand. Sci. (Phys.-Math.)

Russian Federation, Moscow; Moscow

Sergey V. Donchenko

Botkin City Сlinical Hospital

Email: don_03@mail.ru
ORCID iD: 0000-0003-3341-7446

MD, Cand. Sci. (Med.)

Russian Federation, Moscow

Ivan M. Solodilov

Kursk City Clinical Hospital No. 4

Email: Ivan_s_007@mail.ru
ORCID iD: 0000-0001-8219-5582
SPIN-code: 3744-5922

traumatologist

Kursk

Dmitriy A. Ivanov

Lytkarino City Hospital

Email: Ivanovda2001@mail.ru
ORCID iD: 0000-0002-5821-6774
SPIN-code: 9446-1227

traumatologist

Russian Federation, Lytkarino

Anton V. Ovcharenko

Kaluga City Clinical Hospital

Email: antovcharenko@yandex.ru
ORCID iD: 0000-0002-3014-4828

traumatologist

Russian Federation, Kaluga

Vladislav V. Surikov

Russian Medical Academy of Continuous Professional Education

Email: Airbag366@yandex.ru
ORCID iD: 0000-0003-3668-2376
SPIN-code: 9734-7382

graduate student

Russian Federation, Moscow

Evgeniy P. Tarasov

Odintsovo City Hospital

Email: t.john@mail.ru
ORCID iD: 0000-0002-3960-0148

traumatologist

Russian Federation, Odintsovo

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Supplementary files

Supplementary Files
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1. Fig. 1. Universal repositioning-fixation ring with an outer diameter of 52 mm with a stiffening rib for the surgical treatment of acetabular fractures.

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2. Fig. 2. Figures of the ring from the terms of reference and requirements for the manufacture of a ring with an outer diameter of 52 mm with a stiffener.

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3. Fig. 3. Static tests of a universal repositioning-fixation ring with a stiffener for the surgical treatment of acetabular fractures.

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4. Fig. 4. Graphical display of a universal repositioning-fixation ring static tests with a stiffener.

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5. Fig. 5. Diagram of a ring static test with a stiffener in compression.

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6. Fig. 6. Diagram of a ring static test with a tensile stiffener.

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7. Fig. 7. Diagram of a ring static torsion tests results with a stiffener, showing the presence of a permanent deformation of 1.1 °.

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8. Fig. 8. Diagram of a static test for joint tension and twisting of the edges of the split ring with a stiffener.

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