Mechanical and structural peculiarities of tibia shaft nonunion and its influence for treatment

Authors

  • Olexii Popsuishapka Kharkiv Medical Academy of Postgraduate Education. Ukraine, Ukraine
  • Valerii Lytvyshko CHI «Kononenko Chuguyev Central District Hospital», Kharkiv region. Ukraine, Ukraine
  • Olga Pidgaiska Sytenko Institute of Spine and Joint Pathology National Academy of Medical Sciences of Ukraine, Kharkiv, Ukraine https://orcid.org/0000-0002-5025-977X
  • Nataliya Ashukina Sytenko Institute of Spine and Joint Pathology National Academy of Medical Sciences of Ukraine, Kharkiv, Ukraine https://orcid.org/0000-0002-0478-7440
  • Kateryna Nesvit  V. N. Karazin Kharkiv National University. Ukraine, Ukraine
  • Valentyna Maltseva Sytenko Institute of Spine and Joint Pathology National Academy of Medical Sciences of Ukraine, Kharkiv, Ukraine

DOI:

https://doi.org/10.15674/0030-59872020433-42

Keywords:

Tibia shaft fracture, tibia shaft nonunion, finite-element method, regenerate structure, fibula resection, apparatus of external fixation

Abstract

Objective. To study internal tensions in bone and soft tissues of shin at normal condition and at isolated tibia nonunion, the range of fragments displacement, callous structure and to sustain the conception of treatment. Methods. Due to finite element method we created three models: I — anatomic norm; II — transverse defect of 5 mm height on the middle-lower 1/3 border filled with collagen, III — as the second model with empty fibula defect of 10 mm height on the same level 2/3–1/3 border. In 45 patients with tibia shaft nonunion (term 4–18 months) we made resection of fibula fragment 10–15 mm on the same level of tibia nonunion with apparatus of external fixation. We studied the linear bone fragments displacement and callous structure. Results. At the axial loading in normal condition (I model) there was asymmetry of tensions in the lower part of shin bones on the lateral and medial sides. At the II model vertical tensions in the lower part of tibia decreased on the medial side up to 69 % and on the lateral side — up to 44 %, tensions increased in 5 times on the lateral side of fibula. The tangential stresses increased 3 times, their resulting force vector changed the outward direction and increased 7 times. In the III model tension distribution on the tibia surface became close to normal situation. In case of tibia nonunion there was fibrous-cartilages tissues, appeared because of transverse tensions. Patients walked with weight bearing from the first days after surgery, in 95.6 % bone fragments consolidation happened in 3.5–4 months. Conclusion. Excluding of fibula from bearing function due to its 10–15 mm resection on the level of nonunion will normalize the vector of loading in the tibia fragments and fibrous-cartilage regenerate and leads to it ossification.

Author Biographies

Olexii Popsuishapka, Kharkiv Medical Academy of Postgraduate Education. Ukraine

MD, Prof. in Traumatology and Orthopaedics

Valerii Lytvyshko, CHI «Kononenko Chuguyev Central District Hospital», Kharkiv region. Ukraine

PhD in Traumatology and Orthopaedics

Olga Pidgaiska, Sytenko Institute of Spine and Joint Pathology National Academy of Medical Sciences of Ukraine, Kharkiv

PhD in Traumatology and Orthopaedics

Nataliya Ashukina, Sytenko Institute of Spine and Joint Pathology National Academy of Medical Sciences of Ukraine, Kharkiv

PhD in Biol. Sci.

Kateryna Nesvit,  V. N. Karazin Kharkiv National University. Ukraine

PhD in Phys.-Math. Sci.

Valentyna Maltseva, Sytenko Institute of Spine and Joint Pathology National Academy of Medical Sciences of Ukraine, Kharkiv

Phd in Biol. Sci.

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How to Cite

Popsuishapka, O., Lytvyshko, V., Pidgaiska, O., Ashukina, N., Nesvit, K., & Maltseva, V. (2023). Mechanical and structural peculiarities of tibia shaft nonunion and its influence for treatment. ORTHOPAEDICS TRAUMATOLOGY and PROSTHETICS, (4), 33–42. https://doi.org/10.15674/0030-59872020433-42

Issue

No. 4 (2020)

Section

ORIGINAL ARTICLES

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Copyright (c) 2021 Olexii Popsuishapka, Valerii Lytvyshko, Olga Pidgaiska, Nataliya Ashukina, Kateryna Nesvit, Valentyna Maltseva

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